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Journal articles on the topic 'Hemispheres'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Friedrich, Patrick, Kaustubh R. Patil, Lisa N. Mochalski, et al. "Is it left or is it right? A classification approach for investigating hemispheric differences in low and high dimensionality." Brain Structure and Function 227, no. 2 (2021): 425–40. http://dx.doi.org/10.1007/s00429-021-02418-1.

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AbstractHemispheric asymmetries, i.e., differences between the two halves of the brain, have extensively been studied with respect to both structure and function. Commonly employed pairwise comparisons between left and right are suitable for finding differences between the hemispheres, but they come with several caveats when assessing multiple asymmetries. What is more, they are not designed for identifying the characterizing features of each hemisphere. Here, we present a novel data-driven framework—based on machine learning-based classification—for identifying the characterizing features tha

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2

Ikkert, Oksana, Tetiana Korol, Kateryna Hlazunova, and Iryna Tsinkevych. "The Impact of Functional Asymmetry of the Cerebral Hemispheres in Students of a Physics and Mathematics Lyceum on the Learning Outcomes." Journal of Vasyl Stefanyk Precarpathian National University 12, no. 1 (2025): 142–50. https://doi.org/10.15330/jpnu.12.1.142-150.

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The functional asymmetry of the human brain hemispheres (motor, sensory, and mental) reflects the differences in the distribution of neuro-psychic functions between the left and right hemispheres. The left hemisphere is responsible for the brain's abstract-logical, inductive thinking, and verbal-analytical functions. The right hemisphere provides visual-figurative, deductive thinking. The dominance of the left hemisphere determines left-hemispheric thinking, while the dominance of the right hemisphere determines right-hemispheric thinking. The synchronous functioning of both hemispheres indica

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3

Hsiao, Janet H., Ben Cipollini, and Garrison W. Cottrell. "Hemispheric Asymmetry in Perception: A Differential Encoding Account." Journal of Cognitive Neuroscience 25, no. 7 (2013): 998–1007. http://dx.doi.org/10.1162/jocn_a_00377.

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Hemispheric asymmetry in the processing of local and global features has been argued to originate from differences in frequency filtering in the two hemispheres, with little neurophysiological support. Here we test the hypothesis that this asymmetry takes place at an encoding stage beyond the sensory level, due to asymmetries in anatomical connections within each hemisphere. We use two simple encoding networks with differential connection structures as models of differential encoding in the two hemispheres based on a hypothesized generalization of neuroanatomical evidence from the auditory mod

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Miller, Michael B., Alan Kingstone, and Michael S. Gazzaniga. "Hemispheric Encoding Asymmetry is More Apparent Than Real." Journal of Cognitive Neuroscience 14, no. 5 (2002): 702–8. http://dx.doi.org/10.1162/08989290260138609.

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Previous neuroimaging studies have claimed a left hemisphere specialization for episodic “encoding” and a right hemisphere specialization for episodic “retrieval.” Yet studies of split-brain patients indicate relatively minor memory impairment after disconnection of the two hemispheres. This suggests that both hemispheres are capable of encoding and retrieval. In the present experiment, we examined the possible limits on encoding capacity of each hemisphere by manipulating the “depth” of processing during the encoding of unfamiliar faces and familiar words in the left and right hemispheres of

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Chowdhury, Partha, Ravindra Belur, Luca Bertello, and Alexei A. Pevtsov. "Analysis of Solar Hemispheric Chromosphere Properties using the Kodaikanal Observatory Ca–K Index." Astrophysical Journal 925, no. 1 (2022): 81. http://dx.doi.org/10.3847/1538-4357/ac3983.

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Abstract The Kodaikanal Observatory has provided long-term synoptic observations of chromospheric activities in the Ca ii K line (393.34 nm) since 1907. This article investigates temporal and periodic variations of the hemispheric Ca–K-index time series in the low-latitude zone (±40°), utilizing the recently digitized photographic plates of Ca–K images from the Kodaikanal Observatory for the period of 1907–1980. We find that the temporal evolution of the Ca–K index differs from one hemisphere to another, with the solar cycle peaking at different times in the opposite hemisphere, except for cyc

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6

Baybakov, S. E., N. S. Bakhareva, S. V. Chigrin, et al. "Hemispheric Asymmetry Gender Differences in Preadolescent Children." Innovative Medicine of Kuban, no. 1 (March 6, 2023): 53–57. http://dx.doi.org/10.35401/2541-9897-2023-26-1-53-57.

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Background: Investigating various postnatal parameters of cerebral hemispheres is of great practical value.Objective: To study gender differences in hemispheric parameters and interhemispheric interactions in preadolescent children.Materials and methods: The retrospective study assessed archived brain magnetic resonance images of 60 eight-year-old boys and 60 eight-year-old girls. The analyzed parameters were as follows: 1) hemispheric length; 2) hemispheric width; 3) hemispheric height; 4) width-longitudinal index of a hemisphere; 5) altitude-longitudinal index of a hemisphere; 6) length of f

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7

Trach, О. О., D. M. Shyian, and D. I. Marakushin. "Individual variability of the brain hemispheres’ and occipital lobes’ width." Medicine Today and Tomorrow 88, no. 3 (2020): 4–11. http://dx.doi.org/10.35339/msz.2020.88.03.01.

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200 hemispheres of the brain of people who died from diseases not related to brain pathology were studied. Morphometric method was used and statistical analysis was completed. It was found out that the width of the right and left hemispheres of the brain in both men and women of brachycranial skull type is slightly greater than of mesocranial and dolichocranial ones. Men and women with dolichocranial skull type have the width of the left hemisphere greater than the right one. Men have the width of the left and right hemispheres greater than women. The limits of individual variability of brain

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8

Cronin-Golomb, Alice. "Semantic Networks in the Divided Cerebral Hemispheres." Psychological Science 6, no. 4 (1995): 212–18. http://dx.doi.org/10.1111/j.1467-9280.1995.tb00595.x.

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Hemispheric differences in the recognition and manipulation of meaning may be based on distinctions in size, composition, or organization of the right and left semantic networks The present study describes these features of pictorially based semantic networks in 3 subjects with complete forebrain commissurotomy Stimuli were presented for prolonged viewing to the left and right visual hemifields For each trial, the subjects chose from a 20-choice array all pictures that were associated with a target, then indicated the member of each pair of chosen associates that was more closely related to th

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9

Doty, Robert. "Unity from duality." Acta Neurobiologiae Experimentalis 63, no. 3 (2003): 163–70. http://dx.doi.org/10.55782/ane-2003-1464.

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When, in the primeval sea, creatures first began to crawl, "right" and "left" came into being, yielding neuronal nets to control response to the sidedness of stimuli. In the half billion years of moving and sensing, two brains have evolved, the right and the left; and human experience now shows them to be roughly equivalent, potentially independent, conscious entities. This dramatic fact is evidenced by "split-brain" patients and by numerous cases of therapeutic removal of either hemisphere. Equally dramatic, of course, is that there is not the slightest sign of this duality in everyday experi

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10

Schwartz, Theodore H., Michael M. Haglund, Ettore Lettich, and George A. Ojemann. "Asymmetry of Neuronal Activity During Extracellular Microelectrode Recording from Left and Right Human Temporal Lobe Neocortex During Rhyming and Line-Matching." Journal of Cognitive Neuroscience 12, no. 5 (2000): 803–12. http://dx.doi.org/10.1162/089892900562615.

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Recordings of neuronal activity in humans have identified few correlates of the known hemispheric asymmetries of functional lateralization. Here, we examine single-unit activity recorded from both hemispheres during two delayed match-to-sample tasks that show strong hemispheric lateralization based on lesion effects; a line-matching (LM) task related to the right hemisphere, and a rhyming (RHY) task related to the left. Nineteen neuronal populations were recorded with extracellular microelectrodes from the left temporal neocortex of 11 awake patients, and 18 from the right in 9 patients during

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11

Deng, L. H., Y. Fei, H. Deng, Y. Mei, and F. Wang. "Spatial distribution of quasi-biennial oscillations in high-latitude solar activity." Monthly Notices of the Royal Astronomical Society 494, no. 4 (2020): 4930–38. http://dx.doi.org/10.1093/mnras/staa1061.

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ABSTRACT Quasi-biennial oscillations (QBOs) are considered to be a fundamental mode of solar magnetic activity at low latitudes (≤50°). However, the evolutionary aspect and the hemispheric distribution of solar QBOs at high latitudes (≥60°) are rarely studied. Here, we apply a relatively novel time-frequency analysis technique, called the synchrosqueezed wavelet transform, in order to extract the main components of the polar faculae in the Northern and Southern hemispheres for the time interval from 1951 August to 1998 December. We note the following. (i) Apart from the 22-yr Hale cycle, the 1

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Trushina, D. A., O. A. Vedyasova, and M. A. Paramonova. "SPATIAL PICTURE OF DISTRIBUTION OF ELECTROENCEPHALOGRAM RHYTHMS IN THE RIGHT-HANDED STUDENTS DURING AN EXAM." Vestnik of Samara University. Natural Science Series 20, no. 3 (2017): 202–12. http://dx.doi.org/10.18287/2541-7525-2014-20-3-202-212.

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Registration of electroencephalogram (EEG) in the right-handed students during an exam revealed weakening of alpha rhythm in all areas of right and left cerebral hemispheres as well as increased beta rhythm in parietal and end-lobes of the right hemisphere. Simultaneously regular delta waves in the frontal leads ofboth hemispheres and theta waves in right frontal, occipitalis and temporal leads were marked. Oﬀset of EEG slow wave activity in the right hemisphere in partial right-handers was marked in more noticeable way than in that of the true right-handers. The obtained data suggest that the

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13

Voigt, Aiko, Bjorn Stevens, Jürgen Bader, and Thorsten Mauritsen. "The Observed Hemispheric Symmetry in Reflected Shortwave Irradiance." Journal of Climate 26, no. 2 (2013): 468–77. http://dx.doi.org/10.1175/jcli-d-12-00132.1.

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Abstract While the concentration of landmasses and atmospheric aerosols on the Northern Hemisphere suggests that the Northern Hemisphere is brighter than the Southern Hemisphere, satellite measurements of top-of-atmosphere irradiances found that both hemispheres reflect nearly the same amount of shortwave irradiance. Here, the authors document that the most precise and accurate observation, the energy balanced and filled dataset of the Clouds and the Earth’s Radiant Energy System covering the period 2000–10, measures an absolute hemispheric difference in reflected shortwave irradiance of 0.1 W

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14

Hugdahl, Kenneth, and René Westerhausen. "What Is Left Is Right." European Psychologist 14, no. 1 (2009): 78–89. http://dx.doi.org/10.1027/1016-9040.14.1.78.

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The present paper is based on a talk on hemispheric asymmetry given by Kenneth Hugdahl at the Xth European Congress of Psychology, Praha July 2007. Here, we propose that hemispheric asymmetry evolved because of a left hemisphere speech processing specialization. The evolution of speech and the need for air-based communication necessitated division of labor between the hemispheres in order to avoid having duplicate copies in both hemispheres that would increase processing redundancy. It is argued that the neuronal basis of this labor division is the structural asymmetry observed in the peri-Syl

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15

Rebai, Mohamed, Luciano Mecacci, Jean-Didier Bagot, and Claude Bonnet. "Hemispheric Asymmetries in the Visual Evoked Potentials to Temporal Frequency: Preliminary Evidence." Perception 15, no. 5 (1986): 589–94. http://dx.doi.org/10.1068/p150589.

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Steady-state evoked potentials were recorded in eight adult subjects from occipital and temporal leads of both hemispheres to investigate the effect of temporal frequency on the hemispheric specialization for basic visual information. A 3 cycles deg−1 grating was phase-reversed at different temporal frequencies (from 4 to 18 Hz), and the frequency spectrum of evoked potentials was computed by means of a fast Fourier transform program. Significant results were obtained for the component at twice the temporal frequency of stimulation. Occipital evoked potentials did not show hemispheric asymmetr

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16

Nikolaenko, N. N., A. Y. Egorov, and E. A. Freiman. "Representation Activity of The Right and Left Hemispheres of the Brain." Behavioural Neurology 10, no. 2-3 (1997): 49–59. http://dx.doi.org/10.1155/1997/101703.

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Drawings by psychiatric patients were studied in various states (i) in depression; (ii) after neuroleptic injection; and (iii) during left hemisphere suppression induced by unilateral electroconvulsive seizure (UES). In these states, right hemisphere activation predominates. The results of the study demonstrate that, under the predominance of right hemisphere activation over the left hemisphere, there is a tendency to reproduce the image of the object and to represent it in near space. Drawings by psychiatric patients were also investigated in (i) the manic state; (ii) after injection of psych

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17

Shibahara, Naoki, and Brennis Lucero-Wagoner. "Hemispheric Asymmetry in Accessing Word Meanings: Concrete and Abstract Nouns." Perceptual and Motor Skills 94, no. 3_suppl (2002): 1292–300. http://dx.doi.org/10.2466/pms.2002.94.3c.1292.

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The present experiments investigated hemispheric differences in the brain in accessing concrete and abstract word meanings. For this purpose, an automatic semantic priming paradigm was used with a short stimulus onset asynchrony between prime and target (250 msec.) as well as a low proportion of related trials. (20%). Analysis showed that for concrete nouns, priming effects were observed in both hemispheres. There was greater priming in the right hemisphere, suggesting hemispheric differences in accessing semantic representations of concrete nouns. For abstract nouns, on the other hand, primin

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18

Veldema, Jitka, Dennis Alexander Nowak, Kathrin Bösl, and Alireza Gharabaghi. "Hemispheric Differences of 1 Hz rTMS over Motor and Premotor Cortex in Modulation of Neural Processing and Hand Function." Brain Sciences 13, no. 5 (2023): 752. http://dx.doi.org/10.3390/brainsci13050752.

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Introduction: Non-invasive brain stimulation can modulate both neural processing and behavioral performance. Its effects may be influenced by the stimulated area and hemisphere. In this study (EC no. 09083), repetitive transcranial magnetic stimulation (rTMS) was applied to the primary motor cortex (M1) or dorsal premotor cortex (dPMC) of either the right or left hemisphere, while evaluating cortical neurophysiology and hand function. Methods: Fifteen healthy subjects participated in this placebo-controlled crossover study. Four sessions of real 1 Hz rTMS (110% of rMT, 900 pulses) over (i) lef

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Lobel, Daniel S., Rex M. Swanda, and Miklos F. Losonczy. "Lateralized Visual-Field Inattention in Schizophrenia." Perceptual and Motor Skills 79, no. 1 (1994): 699–702. http://dx.doi.org/10.2466/pms.1994.79.1.699.

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Numerous studies have shown impaired verbal functioning in schizophrenic patients as compared with normals. The verbal deficits are generally attributed to damage of the left cerebral hemisphere. This attribution is based on literature which suggests that verbal processing is primarily mediated by the left hemisphere in right-handed humans. This study explored left-hemispheric integrity directly by assessing sustained attention in both the left and right hemispheres of 40 schizophrenic patients with the Weintraub Cancellation Tasks. Patients made significantly more errors of omission on the ri

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20

Yarosh, Oleg Aleksandrovich. "The role of neurotransmitter systems separate the hemispheres of the brain in action the new antiepileptic compounds AGB-31." Reviews on Clinical Pharmacology and Drug Therapy 11, no. 2 (2013): 31–35. http://dx.doi.org/10.17816/rcf11231-35.

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Compound AGB-31, a monocarbamate derivative, is shown to possess a high antiepileptic activity. The mechanisms of antiepileptic action are connected with significant increase in glutamic acid decarboxylase activity in the left hemisphere of the brain, with trend of the glutamate content decrease in the left hemisphere and the tendency to increase GABA in both hemispheres. AGB-31 significantly (more than 3-fold) increases syntase nitric oxide activity in the left hemisphere and has a tendency to reduce the NO content in both hemispheres. AGB-31 significantly (by 63.4%), reduced glutathione pero

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Kuznetsova, S. M., S. G. Mazur, and M. S. Egorova. "PATHOGENETIC FEATURES OF FUNCTIONAL STATE OF THE BRAIN AND CARDIAC CEREBRAL RELATIONSHIPS IN PATIENTS WITH ATHEROTHROMBOSIS AND CARDIOEMBOLIC STROKE." National Journal of Neurology 2, no. 18 (2018): 39–50. http://dx.doi.org/10.61788/njn.v2i18.07.

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The article presents data on the effect of Mexicor in patients who underwent cardioembolic stroke. Thus, Mexicor improves cerebral hemodynamics in Posterior cerebral circulation and causes a reorganization of the structure of brain bioelectrical activity and the type of frequency-amplitude reorganization is determined by the hemispheric localization of the stroke, which may be due to different hemispheres connection with regulating mesencephalic structures and synchronizing diencephalic structures of the brain. In patients with localization of ischemic lesion in the right hemisphere, Mexicor s

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22

Ravindra, Belur, Partha Chowdhury, Pratap Chandra Ray, and Kumaravel Pichamani. "Temporal Evolutions and Quasiperiodic Variations Present in the Sunspot Number and Group Sunspot Area Data Measured at Kodaikanal Observatory for Solar Cycles 14–24." Astrophysical Journal 940, no. 1 (2022): 43. http://dx.doi.org/10.3847/1538-4357/ac98b3.

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Abstract The Kodaikanal Observatory has made synoptic observations of the Sun in white light since 1904, and these images are sketched on the Stonyhurst grids called Sun charts. These continuous hand-drawn data sets are used for long-term studies of the Sun. This article investigates temporal and periodic variations of the monthly hemispheric sunspot number and sunspot group area for 1905–2016, covering solar cycles 14–24. We find that the temporal variations of the sunspot number and group area are different in each hemisphere and peak at different times of the solar cycle in the opposite hem

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23

Ikkert, Oksana, and Tetiana Korol. "CEREBRAL HEMISPHERES FUNCTIONAL ASYMMETRY IN THE EDUCATION OF NATURAL SPECIALTIES AND HUMANITIES STUDENTS." Scientific Journal of Polonia University 58, no. 3 (2023): 90–97. http://dx.doi.org/10.23856/5813.

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The functional asymmetry of the human brain hemispheres (motor, sensory and mental) reflects the difference in the distribution of neuropsychological functions between its right and left hemispheres. Both hemispheres are involved in the implementation of any types of mental activity or regulation of vegetative physiological processes, but each of them provides different aspects of this activity and some processes domination. Persons with left-hemisphere and right-hemisphere thinking differ in the features of perception, analysis, and reproduction of information, which is important in the proce

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24

Лунюшкин, Сергей, Sergey Lunyushkin, Владимир Мишин, et al. "Studying the dynamics of electric currents and polar caps in ionospheres of two hemispheres during the August 17, 2001 geomagnetic storm." Solar-Terrestrial Physics 5, no. 2 (2019): 15–27. http://dx.doi.org/10.12737/stp-52201903.

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The magnetogram inversion technique (MIT), developed at ISTP SB RAS more than forty years ago, has been used until recently only in the Northern Hemisphere. In recent years, MIT has been improved and extended to make instantaneous calculations of 2D distributions of electric fields, horizontal and field-aligned currents in two polar ionospheres. The calculations were carried out based on one-minute ground-based geomagnetic measurements from the worldwide network of stations in both hemispheres (SuperMAG). In this paper, this extended technique is used in the approximation of uniform ionospheri

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Лунюшкин, Сергей, Sergey Lunyushkin, Владимир Мишин, et al. "Studying the dynamics of electric currents and polar caps in ionospheres of two hemispheres during the August 17, 2001 geomagnetic storm." Solnechno-Zemnaya Fizika 5, no. 2 (2019): 17–29. http://dx.doi.org/10.12737/szf-52201903.

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The magnetogram inversion technique (MIT), developed at ISTP SB RAS more than forty years ago, has been used until recently only in the Northern Hemisphere. In recent years, MIT has been improved and extended to make instantaneous calculations of 2D distributions of electric fields, horizontal and field-aligned currents in two polar ionospheres. The calculations were carried out based on one-minute ground-based geomagnetic measurements from the worldwide network of stations in both hemispheres (SuperMAG). In this paper, this extended technique is used in the approximation of uniform ionospheri

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Xue, Jiaqing, Bingchao Wang, Yongkui Yu, Jianping Li, Cheng Sun, and Jiangyu Mao. "Multidecadal variation of northern hemisphere summer monsoon forced by the SST inter-hemispheric dipole." Environmental Research Letters 17, no. 4 (2022): 044033. http://dx.doi.org/10.1088/1748-9326/ac5a65.

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Abstract The sea surface temperature inter-hemispheric dipole (SSTID) is an important variability mode of global SST anomalies, characterized by an anti-phase variation of SST between the two hemispheres. In this study, the decadal variation of the northern hemisphere summer monsoon (NHSM) is found to be strongly regulated by the SSTID, with positive (negative) phases of the SSTID corresponding to the strengthening (weakening) of NHSM. Both observation and SST-forced atmospheric model simulations suggest that the SSTID related thermal forcing modulates the NHSM by causing planetary-scale atmos

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Shibahara, Naoki, and Brennis Lucero-Wagoner. "Access to Concrete Word Meanings in the Cerebral Hemispheres: Facilitation and Inhibition Effects." Perceptual and Motor Skills 96, no. 1 (2003): 166–72. http://dx.doi.org/10.2466/pms.2003.96.1.166.

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In 2002 Shibahara and Lucero-Wagoner, using a priming paradigm, reported a larger facilitation for concrete noun pairs in the right than left hemisphere when the stimulus onset asynchrony was 250 msec. Their related prime-target pairs were similar not only in meaning but also perceptual attributes, such as shape. They had reported such perceptual information to be available only in the right hemisphere early in target processing. Thus, we predicted that, when the stimulus onset asynchrony is long, there would be no effect of perceptual information on target processing in the right hemisphere,

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Aparicio, A. J. P., V. M. S. Carrasco, M. C. Gallego, and J. M. Vaquero. "Hemispheric Sunspot Number from the Madrid Astronomical Observatory for the Period 1935–1986." Astrophysical Journal 931, no. 1 (2022): 52. http://dx.doi.org/10.3847/1538-4357/ac5dc6.

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Abstract Long-term studies on hemispheric asymmetry can help to understand better the solar dynamo. We present the hemispheric sunspot number calculated from daily sunspot observations made at the Madrid Astronomical Observatory for the period 1935–1986 (corresponding approximately to Solar Cycles 17–21). From this data set, we also analyzed the asymmetry index and hemispheric phase shifts. We conclude that the northern hemisphere was predominant in Solar Cycles 17–20, whereas the southern hemisphere was predominant in Solar cycle 21. The strongest asymmetries are found in Solar Cycles 20 (wit

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Voigt, Aiko, Bjorn Stevens, Jürgen Bader, and Thorsten Mauritsen. "Compensation of Hemispheric Albedo Asymmetries by Shifts of the ITCZ and Tropical Clouds." Journal of Climate 27, no. 3 (2014): 1029–45. http://dx.doi.org/10.1175/jcli-d-13-00205.1.

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Abstract Despite a substantial hemispheric asymmetry in clear-sky albedo, observations of Earth’s radiation budget reveal that the two hemispheres have the same all-sky albedo. Here, aquaplanet simulations with the atmosphere general circulation model ECHAM6 coupled to a slab ocean are performed to study to what extent and by which mechanisms clouds compensate hemispheric asymmetries in clear-sky albedo. Clouds adapt to compensate the imposed asymmetries because the intertropical convergence zone (ITCZ) shifts into the dark surface hemisphere. The strength of this tropical compensation mechani

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Van Kaam, Ruud C., Michel J. A. M. van Putten, Sarah E. Vermeer, and Jeannette Hofmeijer. "Contralesional Brain Activity in Acute Ischemic Stroke." Cerebrovascular Diseases 45, no. 1-2 (2018): 85–92. http://dx.doi.org/10.1159/000486535.

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Background: The noninjured, contralateral hemisphere is increasingly acknowledged in the process of recovery from acute ischemic stroke. We estimated the value of conventional electroencephalography (EEG) recordings for identifying contralateral hemisphere involvement in relation to functional recovery. Methods: We analyzed 2-min epochs from 21 electrode EEG registrations of 18 patients with acute hemispheric ischemic stroke and compared with 18 age-matched controls. Outcome was dichotomized as good (modified Rankin Scale [mRS] 0–2) or poor (mRS 3–5 or death) at 3 months. Effects of the infarc

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Veronig, Astrid M., Shantanu Jain, Tatiana Podladchikova, Werner Pötzi, and Frederic Clette. "Hemispheric sunspot numbers 1874–2020." Astronomy & Astrophysics 652 (August 2021): A56. http://dx.doi.org/10.1051/0004-6361/202141195.

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Context. Previous studies show significant north–south asymmetries for various features and indicators of solar activity. These findings suggest some decoupling between the two hemispheres over the solar cycle evolution, which is in agreement with dynamo theories. For the most important solar activity index, the sunspot numbers, so far only limited data are available for the two hemispheres independently. Aims. The aim of this study is to create a continuous series of daily and monthly hemispheric sunspot numbers (HSNs) from 1874 to 2020, which will be continuously expanded in the future with

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Wijaya, Evan. "Game Utilization as a Media to Train the Balance of Left and Right Brain." SISFORMA 4, no. 1 (2017): 12. http://dx.doi.org/10.24167/sisforma.v4i1.1042.

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Human have two brain hemispheres, left hemisphere and right hemisphere. Left hemisphere is used for processing language, words, numbers, equations, etc. Right hemisphere is used for processing creativity, imagination, music, color, etc. Every human should have balance between left and right hemisphere. One method that could be used for balancing brain hemispheres is to use left and right hands for using tools, writing, or typing. “Typing Rhythm” is a game for PC platform, the purpose of this game is for brain balancing exercise by typing lyric of a song while the song is played.

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Hosokawa, K., E. E. Woodfield, M. Lester, et al. "Interhemispheric comparison of spectral width boundary as observed by SuperDARN radars." Annales Geophysicae 21, no. 7 (2003): 1553–65. http://dx.doi.org/10.5194/angeo-21-1553-2003.

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Abstract. Previous studies have shown that dayside equatorward edge of coherent HF radar backscatter having broad Doppler spectral width is coincident with the equatorward edge of the cusp particle precipitation. This enables the boundary between broad and narrow spectral width backscatters (spectral width boundary) in the dayside magnetic local time sector to be used as a proxy for the open/closed field line boundary. The present case study employs magnetically conjugate SuperDARN coherent HF radars to make an inter-hemispheric comparison of the location and variation of the spectral width bo

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Lin 林, Jiaqi 家琪, Feng 锋. Wang 王, Linhua 林华 Deng 邓, Hui 辉. Deng 邓, Ying 盈. Mei 梅, and Xiaojuan 小娟 Zhang 张. "Evolutionary Relationship between Sunspot Groups and Soft X-Ray Flares over Solar Cycles 21–25." Astrophysical Journal 958, no. 1 (2023): 1. http://dx.doi.org/10.3847/1538-4357/ad0469.

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Abstract Studying the interaction between solar flares and sunspot groups (SGs) is crucial for understanding and predicting solar activity. We examined the distribution, correlation, and flaring rates in the northern and southern hemispheres to reveal the relationship between different classes of soft X-ray (SXR) flares and different magnetic classifications of SGs. We discovered a significant north–south asymmetry in SXR flares and SG distribution over Solar Cycles (SC) 21–25. In the rising phase of SC24, the northern hemisphere’s activity is significantly excessive. In the declining phase of

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Weisbrod, Matthias, Sabine Maier, Sabine Harig, Ulrike Himmelsbach, and Manfred Spitzer. "Lateralised semantic and indirect semantic priming effects in people with schizophrenia." British Journal of Psychiatry 172, no. 2 (1998): 142–46. http://dx.doi.org/10.1192/bjp.172.2.142.

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BackgroundIn schizophrenia, disturbances in the development of physiological hemisphere asymmetry are assumed to play a pathogenetic role. The most striking difference between hemispheres is in language processing. The left hemisphere is superior in the use of syntactic or semantic information, whereas the right hemisphere uses contextual information more effectively.MethodUsing psycholinguistic experimental techniques, semantic associations were examined in 38 control subjects, 24 non-thought-disordered and 16 thought-disordered people with schizophrenia, for both hemispheres separately.Resul

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Hartikainen, Kaisa M. "Emotion-Attention Interaction in the Right Hemisphere." Brain Sciences 11, no. 8 (2021): 1006. http://dx.doi.org/10.3390/brainsci11081006.

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Hemispheric asymmetries in affective and cognitive functions have been extensively studied. While both cerebral hemispheres contribute to most affective and cognitive processes, neuroscientific literature and neuropsychological evidence support an overall right hemispheric dominance for emotion, attention and arousal. Emotional stimuli, especially those with survival value such as threat, tend to be prioritized in attentional resource competition. Arousing unpleasant emotional stimuli have prioritized access, especially to right-lateralized attention networks. Interference of task performance

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Dixon, Tanner C., Christina M. Merrick, Joni D. Wallis, Richard B. Ivry, and Jose M. Carmena. "Hybrid dedicated and distributed coding in PMd/M1 provides separation and interaction of bilateral arm signals." PLOS Computational Biology 17, no. 11 (2021): e1009615. http://dx.doi.org/10.1371/journal.pcbi.1009615.

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Pronounced activity is observed in both hemispheres of the motor cortex during preparation and execution of unimanual movements. The organizational principles of bi-hemispheric signals and the functions they serve throughout motor planning remain unclear. Using an instructed-delay reaching task in monkeys, we identified two components in population responses spanning PMd and M1. A “dedicated” component, which segregated activity at the level of individual units, emerged in PMd during preparation. It was most prominent following movement when M1 became strongly engaged, and principally involved

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Matus-Leibovitch, N., D. R. Nussenzveig, M. C. Gershengorn, and Y. Oron. "The hemispheric functional expression of the thyrotropin-releasing-hormone receptor is not determined by the receptors' physical distribution." Biochemical Journal 303, no. 1 (1994): 129–34. http://dx.doi.org/10.1042/bj3030129.

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The thyrotropin-releasing-hormone receptor (TRH-R) is a member of a family of the G-protein-coupled receptors that share structural similarities and exert their physiological action via the inositol lipid signal-transduction pathway. The TRH-R when expressed in Xenopus oocytes exhibits marked preference of the response (increased chloride conductance) for the animal hemisphere. Whereas the rat TRH-R functional distribution was strongly asymmetric (animal/vegetal ratio = 9.5), the mouse TRH-R exhibited a significantly lower ratio (3.9). Truncation of the last 59 amino acids of the C-terminal re

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Piechnik, Stefan K., Marek Czosnyka, Neil G. Harris, Pawan S. Minhas, and John D. Pickard. "A Model of the Cerebral and Cerebrospinal Fluid Circulations to Examine Asymmetry in Cerebrovascular Reactivity." Journal of Cerebral Blood Flow & Metabolism 21, no. 2 (2001): 182–92. http://dx.doi.org/10.1097/00004647-200102000-00010.

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The authors examined the steal phenomenon using a new mathematical model of cerebral blood flow and the cerebrospinal fluid circulation. In this model, the two hemispheres are connected through the circle of Willis by an anterior communicating artery (ACoA) of varying size. The right hemisphere has no cerebrovascular reactivity and the left is normally reactive. The authors studied the asymmetry of hemispheric blood flow in response to simulated changes in arterial blood pressure and carbon dioxide concentration. The hemispheric blood flow was dependent on the local regulatory capacity but not

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Engelhardt, Melina, and Thomas Picht. "1 Hz Repetitive Transcranial Magnetic Stimulation of the Primary Motor Cortex: Impact on Excitability and Task Performance in Healthy Subjects." Journal of Neurological Surgery Part A: Central European Neurosurgery 81, no. 02 (2020): 147–54. http://dx.doi.org/10.1055/s-0040-1701624.

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Abstract Objective Neuronavigated repetitive transcranial stimulation (rTMS) at a frequency of 1 Hz was shown to reduce excitability in underlying brain areas while increasing excitability in the opposite hemisphere. In stroke patients, this principle is used to normalize activity between the lesioned and healthy hemispheres and to facilitate rehabilitation. However, standardization is lacking in applied protocols, and there is a poor understanding of the underlying physiologic mechanisms. Furthermore, the influence of hemispheric dominance on the intervention has not been studied before. A sy

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Mendillo, M., and C. Narvaez. "Ionospheric storms at geophysically-equivalent sites – Part 2: Local time storm patterns for sub-auroral ionospheres." Annales Geophysicae 28, no. 7 (2010): 1449–62. http://dx.doi.org/10.5194/angeo-28-1449-2010.

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Abstract. The response of the mid-latitude ionosphere to geomagnetic storms depends upon several pre-storm conditions, the dominant ones being season and local time of the storm commencement (SC). The difference between a site's geographic and geomagnetic latitudes is also of major importance since it governs the blend of processes linked to solar production and magnetospheric input, respectively. Case studies of specific storms using ionospheric data from both hemispheres are inherently dominated by seasonal effects and the various local times versus longitude of the SCs. To explore inter-hem

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Djukic-Macut, Natasa, Slobodan Malobabic, Natalija Stefanovic, et al. "Asymmetries in numerical density of pyramidal neurons in the fifth layer of the human posterior parietal cortex." Vojnosanitetski pregled 69, no. 8 (2012): 681–85. http://dx.doi.org/10.2298/vsp101126016d.

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Background/Aim. Both superior parietal lobule (SPL) of dorsolateral hemispheric surface and precuneus (PEC) of medial surface are the parts of posterior parietal cortex. The aim of this study was to determine the numerical density (NV) of pyramidal neurons in the layer V of SPL and PEC and their potential differences. Methods. From 20 (40 hemispheres) formaline fixed human brains (both sexes; 27- 65 years) tissue blocks from SPL and PEC from the left and right hemisphere were used. According to their size the brains were divided into two groups, the group I with the larger left (15 brains) and

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Metcalfe, Janet, Margaret Funnell, and Michael S. Gazzaniga. "Right-Hemisphere Memory Superiority: Studies of a Split-Brain Patient." Psychological Science 6, no. 3 (1995): 157–64. http://dx.doi.org/10.1111/j.1467-9280.1995.tb00325.x.

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Six experiments explored hemispheric memory differences in a patient who had undergone complete corpus callosum resection The right hemisphere was better able than the left to reject new events similar to originally presented materials of several types, including abstract visual forms, faces, and categorized lists of words Although the left hemisphere is capable of mental manipulation, imagination, semantic priming, and complex language production, these functions are apparently linked to memory confusions—confusions less apparent in the more literal right hemisphere Differences between the le

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Sakreida, Katrin, Johanna Blume-Schnitzler, Grit Frankemölle, et al. "Hemispheric Dominance for Language and Side Effects in Mapping the Inferior Frontal Junction Area with Transcranial Magnetic Stimulation." Journal of Neurological Surgery Part A: Central European Neurosurgery 81, no. 02 (2020): 130–37. http://dx.doi.org/10.1055/s-0040-1701236.

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Abstract Background and Study Aims Language mapping by navigated transcranial magnetic stimulation (TMS) is commonly applied over the left language-dominant hemisphere to indicate the language-related cortex. Detailed language mapping of Broca's region including stimulation targets in the immediate vicinity to the premotor cortex may raise concern about confounding unspecific motor effects. We performed interhemispheric comparisons to delineate such possible unspecific effects from true TMS-induced language inhibition. Material and Methods Fifteen healthy German speakers named object pictures

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Güler, Mustafa Can, Mehmet Kürşat Karadağ, and Mehmet Aydin. "A Neurophysical Hypothesis on the Role of the Intensity of the Electromagnetic Field Generated by the Cerebral Hemispheres in the Determination of Laterality, in Line with Einstein's Unified Field Theory." Journal of Contemporary Medicine 14, no. 4 (2024): 174–79. http://dx.doi.org/10.16899/jcm.1467668.

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Abstract Objective: Traditional models of cerebral laterality, focusing primarily on anatomical and functional asymmetries, fall short of explaining the underlying physical dynamics. This study pioneers a novel perspective by hypothesizing that the intensity of the electromagnetic field generated by the cerebral hemispheres plays a crucial role in determining laterality. Inspired by Einstein's unified field theory, we explore this hypothesis through an interdisciplinary approach that merges principles of physics with neurophysiology. Material and Methods: Our research employed an innovative ex

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Jang, Junseok, Sungyeong Ryu, Dong Ah Lee, and Kang Min Park. "Are there network differences between the ipsilateral and contralateral hemispheres of pain in patients with episodic migraine without aura?" Annals of Clinical Neurophysiology 25, no. 2 (2023): 93–102. http://dx.doi.org/10.14253/acn.2023.25.2.93.

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Background: We aimed to identif y any differences in the structural covariance network based on structural volume and those in the functional network based on cerebral blood flow between the ipsilateral and contralateral hemispheres of pain in patients with episodic migraine without aura.Methods: We prospectively enrolled 27 patients with migraine without aura, all of whom had unilateral migraine pain. We defined the ipsilateral hemisphere as the side of migraine pain. We measured structural volumes on three-dimensional T1-weighted images and cerebral blood flow using arterial spin labeling ma

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Sydeman, W. J., D. S. Schoeman, S. A. Thompson, et al. "Hemispheric asymmetry in ocean change and the productivity of ecosystem sentinels." Science 372, no. 6545 (2021): 980–83. https://doi.org/10.5281/zenodo.13410513.

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(Uploaded by Plazi for the Bat Literature Project) Sampling seabirds The vastness of the worlds' oceans makes them difficult to monitor. Seabirds that forage and breed across oceans globally have been recognized as sentinels of ocean health. Sydeman et al. looked across seabird species of both the Northern and Southern Hemispheres and found varying patterns. Northern Hemisphere species exhibited greater signs of stress and reduced breeding success, indicative of low fish resources. Southern Hemisphere species showed less impact on reproductive output, suggesting that the fish populations there

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Sydeman, W. J., D. S. Schoeman, S. A. Thompson, et al. "Hemispheric asymmetry in ocean change and the productivity of ecosystem sentinels." Science 372, no. 6545 (2021): 980–83. https://doi.org/10.5281/zenodo.13410513.

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(Uploaded by Plazi for the Bat Literature Project) Sampling seabirds The vastness of the worlds' oceans makes them difficult to monitor. Seabirds that forage and breed across oceans globally have been recognized as sentinels of ocean health. Sydeman et al. looked across seabird species of both the Northern and Southern Hemispheres and found varying patterns. Northern Hemisphere species exhibited greater signs of stress and reduced breeding success, indicative of low fish resources. Southern Hemisphere species showed less impact on reproductive output, suggesting that the fish populations there

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Sydeman, W. J., D. S. Schoeman, S. A. Thompson, et al. "Hemispheric asymmetry in ocean change and the productivity of ecosystem sentinels." Science 372, no. 6545 (2021): 980–83. https://doi.org/10.5281/zenodo.13410513.

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(Uploaded by Plazi for the Bat Literature Project) Sampling seabirds The vastness of the worlds' oceans makes them difficult to monitor. Seabirds that forage and breed across oceans globally have been recognized as sentinels of ocean health. Sydeman et al. looked across seabird species of both the Northern and Southern Hemispheres and found varying patterns. Northern Hemisphere species exhibited greater signs of stress and reduced breeding success, indicative of low fish resources. Southern Hemisphere species showed less impact on reproductive output, suggesting that the fish populations there

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Sydeman, W. J., D. S. Schoeman, S. A. Thompson, et al. "Hemispheric asymmetry in ocean change and the productivity of ecosystem sentinels." Science 372, no. 6545 (2021): 980–83. https://doi.org/10.5281/zenodo.13410513.

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(Uploaded by Plazi for the Bat Literature Project) Sampling seabirds The vastness of the worlds' oceans makes them difficult to monitor. Seabirds that forage and breed across oceans globally have been recognized as sentinels of ocean health. Sydeman et al. looked across seabird species of both the Northern and Southern Hemispheres and found varying patterns. Northern Hemisphere species exhibited greater signs of stress and reduced breeding success, indicative of low fish resources. Southern Hemisphere species showed less impact on reproductive output, suggesting that the fish populations there

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