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Journal articles on the topic 'Fluctuating and directional asymmetries'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Ten Broek, Clara, Liliane Wijnaendts, Frietson Galis, and Stefan Van Dongen. "Human fetuses and limb asymmetry: No evidence for directional asymmetry and support for fluctuating asymmetry as a measure of developmental instability." Animal Biology 60, no. 2 (2010): 169–82. http://dx.doi.org/10.1163/157075610x491716.

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AbstractThe often observed directional asymmetry in human limb bones could have a genetic basis. Alternatively, differences in limbs across sides could emerge from different mechanical loadings on the left and right side as a result of behavioral lateralization. Because handedness in itself has a genetic basis, it has been suggested that directional asymmetry in limbs could develop prenatally as a pre-adaptation to adult life. The developmental origins of limb asymmetry and the presence of directional asymmetry have important implications for the use of directionally random asymmetry (i.e., fl

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Spani, Federica, and Massimiliano Scalici. "Carapace asymmetries in crabs." Crustaceana 91, no. 11 (2018): 1281–90. http://dx.doi.org/10.1163/15685403-00003835.

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Abstract Through the geometric morphometric approach of the landmark-based method applied on adult right-handed specimens of Carcinus aestuarii, Liocarcinus depurator and Potamon fluviatile, statistical analyses showed significant outcomes for fluctuating asymmetry in the three studied species, and directional asymmetry only in P. fluviatile (that showed a less convex carapace shape on the right side, where larger chela occurred). Although these findings may be correlated to some environmental constraints, such as soil composition, refuge occurrence and predatory pressure, also other interpret

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Legay, Jean-Marie. "Biométrie et symétrie des inflorescences de charme." Canadian Journal of Botany 67, no. 11 (1989): 3199–204. http://dx.doi.org/10.1139/b89-399.

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The studied area concerns the inflorescence of the yoke elm, Carpinus betulus, and especially the lobes of the involucre surrounding the fruit for groups of two flowers, which form these inflorescences. Data come from three natural populations, geographically distinct. Two fluctuating asymmetries and two directional asymmetries are noted in the system. Their characteristics and the relations between them are examined. The interpretation takes into account the ontogenesis of the flower structure and leads to a discrimination between populations.

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Faure, P. A., and R. R. Hoy. "Auditory symmetry analysis." Journal of Experimental Biology 203, no. 21 (2000): 3209–23. http://dx.doi.org/10.1242/jeb.203.21.3209.

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The study of biological symmetry continues to be an important and active area of research, yet in the hearing sciences there are no established quantitative methods for measuring auditory asymmetries and dissimilarities in threshold tuning curves (i.e. audiograms). Using a paired design and adopting methods from the analysis of fluctuating asymmetry, we describe methods for auditory researchers interested in delineating auditory asymmetries and comparing tuning curves, behavioral or neural. We illustrate the methods using audiograms of the prothoracic T-cell interneuron in a nocturnal katydid

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Otero, Liliana, Luis Bermudez, Karina Lizarraga, Irene Tangco, Rocelyn Gannaban, and Daniel Meles. "A Comparative Study of Facial Asymmetry in Philippine, Colombian, and Ethiopian Families with Nonsyndromic Cleft Lip Palate." Plastic Surgery International 2012 (October 24, 2012): 1–6. http://dx.doi.org/10.1155/2012/580769.

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Objective. To compare the asymmetry displayed by Philippine, Colombian, and Ethiopian unaffected parents of patients with nonsyndromic cleft palate (NSCLP) and a control population. Methods. Facial measurements were compared between unaffected parents of NSCLP patients and those in the control group for three populations from South America, Asia, and Africa by anthropometric and photographic measurements. Fluctuating and directional asymmetries, height and width proportions, were analyzed and compared. Results. Fluctuating asymmetries (ear length, middle line to Zigion perpendicular for left a

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Pither, Jason, and Philip D. Taylor. "Directional and fluctuating asymmetry in the black-winged damselfly Calopteryx maculata (Beauvois) (Odonata: Calopterygidae)." Canadian Journal of Zoology 78, no. 10 (2000): 1740–48. http://dx.doi.org/10.1139/z00-130.

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Directional asymmetry (DA) has received considerably less attention than fluctuating asymmetry (FA) in the literature. Evidence for DA, however, is building among insect taxa. We examined asymmetries in two wing traits within both sexes of the damselfly Calopteryx maculata (Beauvois) (Odonata: Calopterygidae) sampled from three sites in southeastern Ontario. After accounting for measurement error, we show that proximal segments within right fore and hind wings are consistently longer than those in the left in all but one sample group. Full wing lengths, however, exhibited FA rather than DA. Me

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Parés-Casanova, Pere M., Kirian Narcís Jones Capdevila, and Laura Castel Mas. "Hindlimb lateral and medial acropodial series of cattle are uneven in form." Revista de Ciências Agroveterinárias 19, no. 4 (2020): 468–73. http://dx.doi.org/10.5965/223811711942020468.

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In bovines, fore and hind lateral claws are larger than the medial claws and the heel are deeper and the sole thicker. On this anatomical basis, we hypothesized that it must imply a form (size+shape) asymmetry of the digits. To test this hypothesis, we studied the acropodiums (digital series) of 15 young bovines belonging to Brown Pyrenean breed, irrespective of the gender. Dorso-plantar radiographies were obtained for each hindlimb and the form was studied in a sample of 30 hindlimbs (15 right and 15 left). Images were studied by geometric morphometric methods. A set of 7 paired landmarks on

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Parés-Casanova, Pere M., Pinzón Brando, Daniel Caviedes, and Arcesio Salamanca-Carreño. "Scutation asymmetries in red-footed tortoise Chelonoidis carbonaria Spix, 1824 (Testudines: Testudinidae)." Papéis Avulsos de Zoologia 60 (August 28, 2020): e20206039. http://dx.doi.org/10.11606/1807-0205/2020.60.39.

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The ability of an individual to withstand random perturbations during its development is considered a good indicator of environmental and genetic stress. A common means of assessing developmental stability is through analysis of fluctuating asymmetry (FA) in bilateral traits. Tortoises, with their large, solid plastron, allow for measurement of body geometry. Their bilateral shell scutes are ideal candidates for asymmetries researches. With this issue in mind we assessed, as a preliminary study, levels of plastron scute asymmetry in a sample of 46 red-footed tortoise Chelonoidis carbonaria fro

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Schmidt, Dominik, and Katrin Kahlen. "Towards More Realistic Leaf Shapes in Functional-Structural Plant Models." Symmetry 10, no. 7 (2018): 278. http://dx.doi.org/10.3390/sym10070278.

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Fluctuating asymmetry in plant leaves is a widely used measure in geometric morphometrics for assessing random deviations from perfect symmetry. In this study, we considered the concept of fluctuating asymmetry to improve the prototype leaf shape of the functional-structural plant model L-Cucumber. The overall objective was to provide a realistic geometric representation of the leaves for the light sensitive plant reactions in the virtual plant model. Based on three-dimensional data from several hundred in situ digitized cucumber leaves comparisons of model leaves and measurements were conduct

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Balzeau, Antoine, Lou Ball-Albessard, and Anna Maria Kubicka. "Variation and Correlations in Departures from Symmetry of Brain Torque, Humeral Morphology and Handedness in an Archaeological Sample of Homo sapiens." Symmetry 12, no. 3 (2020): 432. http://dx.doi.org/10.3390/sym12030432.

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The anatomical asymmetries of the human brain are the subject of a great deal of scientific interest because of their links with handedness and lateralized cognitive functions. Information about lateralization in humans is also available from the post-cranial skeleton, particularly the arm bones, in which differences in size and shape are related to hand/arm preference. Our objective here is to characterize the possible correlations between the endocranial and post-cranial asymmetries of an archaeological sample. This, in turn, will allow us to try to identify and interpret prospective functio

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Parés-Casanova, Pere M. "Skull asymmetries in wild boar (Sus scrofa LINNAEUS, 1758)." Brazilian Journal of Veterinary Research and Animal Science 56, no. 1 (2019): e150704. http://dx.doi.org/10.11606/issn.1678-4456.bjvras.2019.150704.

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Organisms can develop different kinds of asymmetry when deviations from expected perfect symmetry occur. Among others are fluctuating asymmetry (FA) and directional asymmetry (DA). FA represents small random differences between corresponding parts on the left and right sides of an individual in bilaterally paired structures. It is thought that FA reflects an organism’s ability to cope with genetic and environmental stress during growth. DA occurs whenever one side on the plane of symmetry develops more than the other side, and has a genetic component. In this research, we examined the expressi

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Prentice-Mott, Harrison V., Yasmine Meroz, Andreas Carlson, et al. "Directional memory arises from long-lived cytoskeletal asymmetries in polarized chemotactic cells." Proceedings of the National Academy of Sciences 113, no. 5 (2016): 1267–72. http://dx.doi.org/10.1073/pnas.1513289113.

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Chemotaxis, the directional migration of cells in a chemical gradient, is robust to fluctuations associated with low chemical concentrations and dynamically changing gradients as well as high saturating chemical concentrations. Although a number of reports have identified cellular behavior consistent with a directional memory that could account for behavior in these complex environments, the quantitative and molecular details of such a memory process remain unknown. Using microfluidics to confine cellular motion to a 1D channel and control chemoattractant exposure, we observed directional memo

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BABCOCK, LOREN E. "Asymmetry in the fossil record." European Review 13, S2 (2005): 135–43. http://dx.doi.org/10.1017/s1062798705000712.

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Asymmetry is a fundamental aspect of the biology of all organisms, and has a deep evolutionary history. The fossil record contains evidence of both morphological and behavioural asymmetries. Morphological asymmetry is most commonly expressed as conspicuous, directional asymmetry (either lateral asymmetry or spiral asymmetry) in body fossils. Few examples of fluctuating asymmetry, a form of subtle asymmetry, have been documented from fossils. Body fossil evidence indicates that morphological asymmetry dates to the time of the appearance of the first life on Earth (Archaean Eon). Behavioural asy

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Scopece, Giovanni, Nicolas Juillet, Christian Lexer, and Salvatore Cozzolino. "Fluctuating selection across years and phenotypic variation in food-deceptive orchids." PeerJ 5 (August 25, 2017): e3704. http://dx.doi.org/10.7717/peerj.3704.

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Nectarless flowers that deceive pollinators offer an opportunity to study asymmetric plant-insect interactions. Orchids are a widely used model for studying these interactions because they encompass several thousand species adopting deceptive pollination systems. High levels of intra-specific phenotypic variation have been reported in deceptive orchids, suggesting a reduced consistency of pollinator-mediated selection on their floral traits. Nevertheless, several studies report on widespread directional selection mediated by pollinators even in these deceptive orchids. In this study we test th

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Parés-Casanova, Pere M., René Alejandro Crosby-Granados, Fabián Muñoz, and Arcesio Salamanca-Carreño. "Marked Directional Skull Asymmetry in the Araucan Horse." VCOT Open 03, no. 01 (2020): e11-e18. http://dx.doi.org/10.1055/s-0040-1702986.

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Abstract Background Deviations from the perfect symmetry of normally bilateral symmetrical characters occur during individual development due to the influence of multiple factors. Fluctuating asymmetry (FA) is the random developmental variation of a trait (or character) that is perfectly symmetrical, on average, across a population. Directional asymmetry (DA) occurs when one side of the pair of body sides is strongly more marked. Objective We investigated the presence and level of skull FA and DA in the Araucan horse, a breed from East Colombia. Study Design A sample of 21 skulls belonging to

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Melchionna, Marina, Antonio Profico, Costantino Buzi, et al. "A New Integrated Tool to Calculate and Map Bilateral Asymmetry on Three-Dimensional Digital Models." Symmetry 13, no. 9 (2021): 1644. http://dx.doi.org/10.3390/sym13091644.

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The observation and the quantification of asymmetry in biological structures are deeply investigated in geometric morphometrics. Patterns of asymmetry were explored in both living and fossil species. In living organisms, levels of directional and fluctuating asymmetry are informative about developmental processes and health status of the individuals. Paleontologists are primarily interested in asymmetric features introduced by the taphonomic process, as they may significantly alter the original shape of the biological remains, hampering the interpretation of morphological features which may ha

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Ekrami, Omid, Peter Claes, Julie D. White, et al. "A Multivariate Approach to Determine the Dimensionality of Human Facial Asymmetry." Symmetry 12, no. 3 (2020): 348. http://dx.doi.org/10.3390/sym12030348.

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Many studies have suggested that developmental instability (DI) could lead to asymmetric development, otherwise known as fluctuating asymmetry (FA). Several attempts to unravel the biological meaning of FA have been made, yet the main step in estimating FA is to remove the effects of directional asymmetry (DA), which is defined as the average bilateral asymmetry at the population level. Here, we demonstrate in a multivariate context that the conventional method of DA correction does not adequately compensate for the effects of DA in other dimensions of asymmetry. This appears to be due to the

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Parés-Casanova, P. "Existence of mandibular directional asymmetry in the European wild boar (Sus scrofa Linnaeus, 1758)." Journal of Morphological Sciences 31, no. 04 (2014): 228–32. http://dx.doi.org/10.4322/jms.064613.

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Abstract Introduction and material and methods. We studied a sample of 37 dentulous dry mandibles from European wild board (Sus scrofa) and compared both the right and left sides in their dorsal aspect. To study the influence of age, the samples were grouped according to dental status: “subadults” (erupting 3rd M, n=22) and “adults” (fully erupted 3rd M, n=15). Individual levels of asymmetry were analysed from x- and y-coordinates of the 16 landmarks on the dorsal aspect of the mandible. Results. The analysis separated directional asymmetry (one side of the body with a larger character value t

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Shapochkina, I. V., T. Ye Korochkova, V. M. Rozenbaum, A. S. Bugaev, and L. I. Trakhtenberg. "Temperature-Frequency Controlling the Characteristics of a Pulsating Brownian Ratchet with Slightly Fluctuating Potential Energy." Nonlinear Phenomena in Complex Systems 24, no. 1 (2021): 71–83. http://dx.doi.org/10.33581/1561-4085-2021-24-1-71-83.

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Within the approximation of slight fluctuations of the nanoparticle potential energy, we developed a method for calculating the characteristics of a Brownian ratchet (a complex nonlinear system capable of extracting useful work from unbiased nonequilibrium fluctuations). The method is suitable for studying the mechanisms and modes of functioning of artificial nanomotors. Unlike the effort-consuming obtaining and applying for this studying the Green's functions of the coordinate representation which describe diffusion in the stationary component of the potential, the proposed method operates wi

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Gómez-Robles, Aida, William D. Hopkins, Steven J. Schapiro, and Chet C. Sherwood. "The heritability of chimpanzee and human brain asymmetry." Proceedings of the Royal Society B: Biological Sciences 283, no. 1845 (2016): 20161319. http://dx.doi.org/10.1098/rspb.2016.1319.

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Human brains are markedly asymmetric in structure and lateralized in function, which suggests a relationship between these two properties. The brains of other closely related primates, such as chimpanzees, show similar patterns of asymmetry, but to a lesser degree, indicating an increase in anatomical and functional asymmetry during hominin evolution. We analysed the heritability of cerebral asymmetry in chimpanzees and humans using classic morphometrics, geometric morphometrics, and quantitative genetic techniques. In our analyses, we separated directional asymmetry and fluctuating asymmetry

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Cerio, Donald G., and Lawrence M. Witmer. "Intraspecific variation and symmetry of the inner-ear labyrinth in a population of wild turkeys: implications for paleontological reconstructions." PeerJ 7 (July 23, 2019): e7355. http://dx.doi.org/10.7717/peerj.7355.

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The cochlea and semicircular canals (SCCs) of the inner ear are vital neurosensory devices. There are associations between the anatomy of these sensorineural structures, their function, and the function of related biological systems, for example, hearing ability, gaze stabilization, locomotor agility, and posture. The endosseous labyrinth is frequently used as a proxy to infer the performance of the hearing and vestibular systems, locomotor abilities, and ecology of extinct species. Such fossil inferences are often based on single specimens or even a single ear, representing an entire species.

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Kraak, Sarah B. M. "Fluctuating around directional asymmetry?" Trends in Ecology & Evolution 12, no. 6 (1997): 230. http://dx.doi.org/10.1016/s0169-5347(97)86959-5.

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Radovic, Sanja, Aleksandar Urosevic, Katarina Hocevar, Ana Vuleta, Sanja Manitasevic-Jovanovic, and Branka Tucic. "Geometric morphometrics of functionally distinct floral organs in Iris pumila: Analyzing patterns of symmetric and asymmetric shape variations." Archives of Biological Sciences 69, no. 2 (2017): 223–31. http://dx.doi.org/10.2298/abs160912086r.

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The Iris flower is a complex morphological structure composed of two trimerous whorls of functionally distinct petaloid organs (the falls and the standards), one whorl of the stamens and one tricarpellary gynoecium. The petal-like style arms of the carpels are banded over the basal part of the falls, forming three pollination tunnels, each of which is perceived by the Iris pollinators as a single bilaterally symmetrical flower. Apart from the stamens, all petaloid floral organs are preferentially involved in advertising rewards to potential pollinators. Here we used the methods of geometric mo

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van den Berg, A. V., and H. Collewijn. "Directional asymmetries of human optokinetic nystagmus." Experimental Brain Research 70, no. 3 (1988): 597–604. http://dx.doi.org/10.1007/bf00247608.

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Kuebel Cervantes, B. T., J. S. Allen, and R. M. Samelson. "Lagrangian characteristics of continental shelf flows forced by periodic wind stress." Nonlinear Processes in Geophysics 11, no. 1 (2004): 3–16. http://dx.doi.org/10.5194/npg-11-3-2004.

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Abstract. The coastal ocean may experience periods of fluctuating along-shelf wind direction, causing shifts between upwelling and downwelling conditions with responses that are not symmetric. We seek to understand these asymmetries and their implications on the Eulerian and Lagrangian flows. We use a two-dimensional (variations across-shelf and with depth; uniformity along-shelf) primitive equation numerical model to study shelf flows in the presence of periodic, zero-mean wind stress forcing. The model bathymetry and initial stratification is typical of the broad, shallow shelf off Duck, NC

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Rodriguez, R., and R. J. Fries. "Azimuthal Asymmetries From Jets Quenched In Fluctuating Backgrounds." Journal of Physics: Conference Series 446 (September 19, 2013): 012003. http://dx.doi.org/10.1088/1742-6596/446/1/012003.

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Kobyliansky, E., and S. Micle. "Handedness and dermatoglyphic directional and fluctuating asymmetry." Zeitschrift für Morphologie und Anthropologie 76, no. 3 (1986): 313–29. http://dx.doi.org/10.1127/zma/76/1986/313.

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Sciulli, Paul W. "Dental Asymmetry in a Late Archaic and Late Prehistoric Skeletal Sample of the Ohio Valley Area." Dental Anthropology Journal 16, no. 2 (2018): 33–44. http://dx.doi.org/10.26575/daj.v16i2.158.

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Dental asymmetry (directional, anti-symmetry, and fluctuating) is analyzed in samples from two prehistoric Native American populations: a terminal Late Archaic population (3200-2700 BP) and a Late Prehistoric population (ca. 750 BP). Both directional and fluctuating asymmetry were found in each sample. Directional asymmetry occurs in only four teeth in the Late Archaic sample and in two teeth in the Late Prehistoric sample. Neither sample exhibits the tendency for opposing arch dominance in directional asymmetry. Fluctuating asymmetry is significantly greater than measurement error for all tee

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Goncalves, D. M., P. C. Simoes, A. C. Chumbinho, M. J. Correia, T. Fagundes, and R. F. Oliveira. "Fluctuating asymmetries and reproductive success in the peacock blenny." Journal of Fish Biology 60, no. 4 (2002): 810–20. http://dx.doi.org/10.1111/j.1095-8649.2002.tb02411.x.

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manns, martina. "the riddle of nature and nurture – lateralization has an epigenetic trait." Behavioral and Brain Sciences 28, no. 4 (2005): 602–3. http://dx.doi.org/10.1017/s0140525x05360109.

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vallortigara & rogers's (v&r's) proposal that directional asymmetries evolved under social pressures raises questions about the ontogenetic mechanisms subserving the alignment of asymmetries in a population. neuro-ontogenetic principles suggest that epigenetic factors are decisively involved in the determination of individual lateralization and that genetic factors align their direction. clearly, directional asymmetry has an epigenetic trait.

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Ke, Sally R., Jessica Lam, Dinesh K. Pai, and Miriam Spering. "Directional Asymmetries in Human Smooth Pursuit Eye Movements." Investigative Opthalmology & Visual Science 54, no. 6 (2013): 4409. http://dx.doi.org/10.1167/iovs.12-11369.

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Wan, A. S., B. LaBombard, B. Lipschultz, and T. F. Yang. "Directional asymmetries in the Alcator C edge plasma." Journal of Nuclear Materials 145-147 (February 1987): 191–95. http://dx.doi.org/10.1016/0022-3115(87)90325-4.

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Del Taglia, Christian, Lars Blum, Ju¨rg Gass, Yiannis Ventikos, and Dimos Poulikakos. "Numerical and Experimental Investigation of an Annular Jet Flow With Large Blockage." Journal of Fluids Engineering 126, no. 3 (2004): 375–84. http://dx.doi.org/10.1115/1.1760533.

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Unsteady 3-D numerical simulations and 3-D LDA measurements of an annular jet with a blockage ratio of 0.89 and Reynolds number 4400 are presented. At these flow conditions, the flow inside of the recirculation zone is asymmetric, with a preferential direction. Very good predictions of the velocity fluctuation values are achieved with the unsteady simulation technique in the same region, as the fluctuations are mainly large scale, structure dominated. A frequency near to 10 Hz is identified in the simulations, which is attributed to the principal shedding behavior of the vortical structures.

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Kirchengast, Sylvia. "Asymmetry patterns are associated with body size and somatic robustness among adult !Kung San and Kavango people." Anthropological Review 82, no. 1 (2019): 43–63. http://dx.doi.org/10.2478/anre-2019-0004.

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Abstract Asymmetry of bilateral anatomical structures is widely found in nature. Fluctuating asymmetry, i.e. mostly tiny random deviations from perfect symmetry in bilateral structures, is mainly interpreted within the framework of developmental instability. This interpretation is mainly due to the fact, that higher fluctuating asymmetry is often found in association with various pathological conditions but also from increased stress during somatic development. Directional asymmetry, in contrast, describes a distinct pattern of bilateral variation in a group of individuals, characterized by th

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Calhim, Sara, Stephen Pruett-Jones, Michael S. Webster, and Melissah Rowe. "Asymmetries in reproductive anatomy: insights from promiscuous songbirds." Biological Journal of the Linnean Society 128, no. 3 (2019): 569–82. http://dx.doi.org/10.1093/biolinnean/blz100.

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Abstract Directional asymmetry in gonad size is commonly observed in vertebrates and is particularly pronounced in birds, where the left testis is frequently larger than the right. The adaptive significance of directional asymmetry in testis size is poorly understood, and whether it extends beyond the testes (i.e. side-correspondent asymmetry along the reproductive tract) has rarely been considered. Using the Maluridae, a songbird family exhibiting variation in levels of sperm competition and directional testis asymmetry, yet similar in ecology and life history, we investigated the relative ro

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Thornhill, Randy, and Steven W. Gangestad. "Human Fluctuating Asymmetry and Sexual Behavior." Psychological Science 5, no. 5 (1994): 297–302. http://dx.doi.org/10.1111/j.1467-9280.1994.tb00629.x.

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This report presents evidence that sexual selection may favor developmental stability (i e, the absence of fluctuating asymmetry) in humans Subtle, heritable asymmetries in seven nonfacial human body traits correlated negatively with number of self-reported, lifetime sex partners and correlated positively with self-reported age at first copulation in a college student sample These relationships remained statistically significant when age, marital status, body height, ethnicity, physical anomalies associated with early prenatal development, and physical attractiveness were statistically control

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Cord, Mary T., Rauna K. Surr, Brian E. Walden, and Andrew B. Dittberner. "Ear Asymmetries and Asymmetric Directional Microphone Hearing Aid Fittings." American Journal of Audiology 20, no. 2 (2011): 111–22. http://dx.doi.org/10.1044/1059-0889(2011/10-0035).

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Baghestani, Hamid, and Jorg Bley. "Do directional predictions of US gasoline prices reveal asymmetries?" Journal of Economics and Finance 44, no. 2 (2019): 348–60. http://dx.doi.org/10.1007/s12197-019-09496-2.

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Rohe, Karl, Tai Qin, and Bin Yu. "Co-clustering directed graphs to discover asymmetries and directional communities." Proceedings of the National Academy of Sciences 113, no. 45 (2016): 12679–84. http://dx.doi.org/10.1073/pnas.1525793113.

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In directed graphs, relationships are asymmetric and these asymmetries contain essential structural information about the graph. Directed relationships lead to a new type of clustering that is not feasible in undirected graphs. We propose a spectral co-clustering algorithm called di-sim for asymmetry discovery and directional clustering. A Stochastic co-Blockmodel is introduced to show favorable properties of di-sim. To account for the sparse and highly heterogeneous nature of directed networks, di-sim uses the regularized graph Laplacian and projects the rows of the eigenvector matrix onto th

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Kriengwatana, Buddhamas Pralle, and Paola Escudero. "Directional Asymmetries in Vowel Perception of Adult Nonnative Listeners Do Not Change Over Time With Language Experience." Journal of Speech, Language, and Hearing Research 60, no. 4 (2017): 1088–93. http://dx.doi.org/10.1044/2016_jslhr-h-16-0050.

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Purpose This study tested an assumption of the Natural Referent Vowel (Polka & Bohn, 2011) framework, namely, that directional asymmetries in adult vowel perception can be influenced by language experience. Method Data from participants reported in Escudero and Williams (2014) were analyzed. Spanish participants categorized the Dutch vowels /aː/ and /ɑ/ in 2 separate sessions: before and after vowel distributional training. Sessions were 12 months apart. Categorization was assessed using the XAB task, where on each trial participants heard 3 sounds sequentially (first X, then A, then B) an

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dräger, bianca, caterina breitenstein, and stefan knecht. "rethinking brain asymmetries in humans." Behavioral and Brain Sciences 28, no. 4 (2005): 598–99. http://dx.doi.org/10.1017/s0140525x05320103.

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similar to directional asymmetries in animals, language lateralization in humans follows a bimodal distribution. a majority of individuals are lateralized to the left and a minority of individuals are lateralized to the right side of the brain. however, a biological advantage for either lateralization is lacking. the scenario outlined by vallortigara & rogers (v&r) suggests that language lateralization in humans is not specific to language or human speciation but simply follows an evolutionarily conserved organizational principle of the brain.

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Hasson, O., and Y. Rossler. "CHARACTER-SPECIFIC HOMEOSTASIS DOMINATES FLUCTUATING ASYMMETRIES IN THE MEDFLY (DIPTERA: TEPHRITIDAE)." Florida Entomologist 85, no. 1 (2002): 73–82. http://dx.doi.org/10.1653/0015-4040(2002)085[0073:cshdfa]2.0.co;2.

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Russak, Olivia Diane Fern, Lindsay Ives, Vijay A. Mittal, and Derek J. Dean. "Fluctuating dermatoglyphic asymmetries in youth at ultrahigh-risk for psychotic disorders." Schizophrenia Research 170, no. 2-3 (2016): 301–3. http://dx.doi.org/10.1016/j.schres.2015.12.013.

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Scheiner, Samuel M., Roberta L. Caplan, and Richard F. Lyman. "The genetics of phenotypic plasticity. III. Genetic correlations and fluctuating asymmetries." Journal of Evolutionary Biology 4, no. 1 (1991): 51–68. http://dx.doi.org/10.1046/j.1420-9101.1991.4010051.x.

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Wexler, Mark, Marianne Duyck, and Pascal Mamassian. "Persistent states in vision break universality and time invariance." Proceedings of the National Academy of Sciences 112, no. 48 (2015): 14990–95. http://dx.doi.org/10.1073/pnas.1508847112.

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Studies of perception usually emphasize processes that are largely universal across observers and—except for short-term fluctuations—stationary over time. Here we test the universality and stationarity assumptions with two families of ambiguous visual stimuli. Each stimulus can be perceived in two different ways, parameterized by two opposite directions from a continuous circular variable. A large-sample study showed that almost all observers have preferred directions or biases, with directions lying within 90 degrees of the bias direction nearly always perceived and opposite directions almost

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López-Aguirre, Camilo, and Jairo Pérez-Torres. "Asimetría cráneo-mandibular de Artibeus lituratus (Chiroptera, Phyllostomidae) en Colombia." Universitas Scientiarum 20, no. 1 (2014): 141. http://dx.doi.org/10.11144/javeriana.sc20-1.acal.

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Analyzing asymmetry in species associated with disturbed environments enables the evaluation of the morphological plasticity of generalistic species and the different evolutionary responses of sexes or populations to environmental or genetic stress. This report is a study of the cranial and mandibular asymmetry of Colombian Artibeus lituratus. This species has a wide distribution and high abundance, but its morphological plasticity remains uncertain. We characterized its presence, fluctuating asymmetry, directional asymmetry and antisymmetry by measuring 11 craneometric traits in 146 adults fr

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Brown, Charles R., Mary Bomberger Brown, Erin A. Roche, Valerie A. O’Brien, and Catherine E. Page. "Fluctuating survival selection explains variation in avian group size." Proceedings of the National Academy of Sciences 113, no. 18 (2016): 5113–18. http://dx.doi.org/10.1073/pnas.1600218113.

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Most animal groups vary extensively in size. Because individuals in certain sizes of groups often have higher apparent fitness than those in other groups, why wide group size variation persists in most populations remains unexplained. We used a 30-y mark–recapture study of colonially breeding cliff swallows (Petrochelidon pyrrhonota) to show that the survival advantages of different colony sizes fluctuated among years. Colony size was under both stabilizing and directional selection in different years, and reversals in the sign of directional selection regularly occurred. Directional selection

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Masapollo, Matthew, Linda Polka, Monika Molnar, and Lucie Ménard. "Directional asymmetries reveal a universal bias in adult vowel perception." Journal of the Acoustical Society of America 141, no. 4 (2017): 2857–69. http://dx.doi.org/10.1121/1.4981006.

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Roditi, Rachel E., and Benjamin T. Crane. "Directional Asymmetries and Age Effects in Human Self-Motion Perception." Journal of the Association for Research in Otolaryngology 13, no. 3 (2012): 381–401. http://dx.doi.org/10.1007/s10162-012-0318-3.

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Ryan, Michael J., Karen M. Warkentin, Blinda E. McClelland, and Walter Wilczynski. "Fluctuating asymmetries and advertisement call variation in the cricket frog, Acris crepitans." Behavioral Ecology 6, no. 2 (1995): 124–31. http://dx.doi.org/10.1093/beheco/6.2.124.

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