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Dissertations / Theses on the topic 'Phosphenes'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

RINALDI, ADELE. "Phosphenes in space: a study on the interaction between carbon ions and rod photoreceptor." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2009. http://hdl.handle.net/2108/995.

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I fosfeni, o light flash, sono stati percepiti per la prima volta durante il volo verso la luna della navicella Apollo. In genere sono avvertiti al buio, prima di addormentarsi. In questa tesi si studia l'ipotesi di una eccitazione dei fotorecettori della retina da parte di ioni pesanti (carbonio). Campioni di recettori dei bastoncelli vengono irradiati, e viene studiato l'effetto degli ioni carbonio su topo, attraverso la registrazione della risposta elettrofisiologica (segnale retinico e corticale). La tesi si e' sviluppata nell'ambito del progetto ALTEA (Anomaluos Long Term Effect on Astro
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2

Ledger, Araminta. "Chelating phosphine complexes of ruthenium for the co-ordination and activation of small molecules." Thesis, University of Bath, 2011. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.545330.

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3

Chen, Spencer Chin-Yu Graduate School of Biomedical Engineering Faculty of Engineering UNSW. "The perception and comprehension of prosthetic vison: patient rehabilitation and image processing considerations from simulated prosthetic vision psychophysics." Publisher:University of New South Wales. Graduate School of Biomedical Engineering, 2009. http://handle.unsw.edu.au/1959.4/44414.

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A successful restoration of vision should allow the blind to look, to see and to understand. The engineering of a microelectronic vision prosthesis has come a long way over the last forty years, but the understanding of how the restored form of vision would be interpreted and functionally applied to everyday living has made little progress until recent times. Prosthetic vision is not what most people think it would be; it is a visual scene composed of relatively large, isolated, spots of light so-called "phosphenes", very much like a magnified pictorial print. This thesis dissertation seeks to
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4

CONVENTO, SILVIA. "The “multisensory” visual cortex: crossmodal shaping of visual cortical ​responses and ​​perception​." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2015. http://hdl.handle.net/10281/68621.

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The convergence and integration of information from the different sensory channels represents a fundamental ability of the human brain: in our daily life, multisensory cues impact our sensory system, shaping our perception of sensory events. Classical models of multisensory perception defer integration until sensory-specific information has been extensively processed. Strikingly, several anatomical studies now suggest that this view may be over-simplistic and that the substrate for multisensory integration is not constrained to the classical area of multisensory convergence; rather, it also oc
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5

Hallum, Luke Edward Graduate School of Biomedical Engineering Faculty of Engineering UNSW. "Prosthetic vision : Visual modelling, information theory and neural correlates." Publisher:University of New South Wales. Graduate School of Biomedical Engineering, 2008. http://handle.unsw.edu.au/1959.4/41450.

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Electrical stimulation of the retina affected by photoreceptor loss (e.g., cases of retinitis pigmentosa) elicits the perception of luminous spots (so-called phosphenes) in the visual field. This phenomenon, attributed to the relatively high survival rates of neurons comprising the retina's inner layer, serves as the cornerstone of efforts to provide a microelectronic retinal prosthesis -- a device analogous to the cochlear implant. This thesis concerns phosphenes -- their elicitation and modulation, and, in turn, image analysis for use in a prosthesis. This thesis begins with a comparative r
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6

KRUGER, VIRGINIE. "Synthese de nouveaux phosphetanes chiraux et applications en catalyse." Paris 6, 1997. http://www.theses.fr/1997PA066405.

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Cette these illustre la synthese de nouveaux phosphetanes chiraux et leur utilisation comme ligands pour la catalyse enantioselective par les complexes du palladium et du rhodium. Apres une etude bibliographique des voies de synthese du cycle phosphetane, la preparation de l'oxyde de 1-menthyl-2, 2, 3, 3-tetramethylphosphetane est decrite. Ce compose est utilise comme produit de depart pour la synthese des differents ligands fonctionnalises en du phosphore. Divers electrophiles sont en effet introduits sur le cycle phosphore par une reaction de metallation-alkylation, conduisant a des phosphet
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7

Jus, Sébastien. "Synthese de nouveaux phosphetanes chiraux - applications en hydrogenation catalytique enantioselectivite." Paris 6, 2000. http://www.theses.fr/2000PA066238.

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Au cours de ce travail, nous avons developpe la synthese des 1,2-bis(2,4-dialkylphosphetano)benzenes et 1,2-bis(2,4-dialkylphosphetano)ethanes chiraux. L'hydrogenation catalytique enantioselective de dicetones 1,3 nous a permis un acces aise et efficace aux diols 1,3 anti symetriques optiquement purs. Ces diols ont servi a la synthese d'une serie de bisphosphetanes portant sur les cycles phosphores des substituants alkyles d'encombrements varies. Nous avons montre l'efficacite des bisphosphetanes en tant que ligands dans l'hydrogenation catalytique enantioselective. Des exces enantiomeriques p
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8

Gün, Hülya [Verfasser], Walter [Gutachter] Frank, and Christian [Gutachter] Ganter. "Untersuchungen zur Reaktivität von ausgewählten Phosphanen und Phospheten gegenüber Lewis-Säuren / Hülya Gün ; Gutachter: Walter Frank, Christian Ganter." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2017. http://d-nb.info/1143899083/34.

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9

Mocanu, Olivia. "Phosphole and phosphepine-based π-systems : synthesis, reactivity and physical properties". Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S166.

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Ce manuscrit décrit la synthèse et les caractérisations physico-chimiques de nouveaux systèmes hétérocycliques π-conjugués contenant un atome de phosphore. Le chapitre d'introduction présente les différentes voies de synthèse du cycle phospholes pouvant être incorporé dans des systèmes π-conjugués. Le chapitre I décrit la synthèse et les propriétés physico-chimiques de dérivés du pyrène contenant soit un phosphole, soit un silole. La synthèse de ces nouvelles structures a été réalisée à l'aide de réactions métallo-catalysées. Deux types de régioisomères ont ainsi été synthétisés afin de déterm
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10

Fjellander, Ester. "Self-adaptable catalysts : Importance of flexibility and applications in asymmetric catalysis." Doctoral thesis, KTH, Organisk kemi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12852.

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The topic of this thesis is the design and synthesis of biaryl-based self adaptableligands for asymmetric metal catalysis. The results discussed in papers I-III are covered, together with some unpublished results concerning substrate-adaptable catalysts. A general survey of self-adaptable catalysts is presented first. The second chapter of this thesis starts with a survey of inversion barriers in biphenyl-based ligands and catalysts. Thereafter, the determination of barriers to conformational adaptation in dibenzoazepines and dibenzophosphepines is described. Palladium complexes with a diphosp
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11

Zalubovskis, Raivis. "Flexibility – a tool for chirality control in asymmetric catalysis." Doctoral thesis, KTH, Kemi, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4166.

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This thesis deals with the design and synthesis of ligands for asymmetric catalysis: palladium catalyzed allylic alkylations, and rho-dium and iridium catalyzed hydrogenations of olefins. Chirally flexible phosphepine ligands based on biphenyl were synthesized and their properties were studied. The rotation barrier for configurationally flexible phosphepines was determined by NMR spectroscopy. The ratio of the atropisomers was shown to depend on the group bound to phosphorus. Only complexes with two homochiral ligands bound to the metal center were observed upon complexation with Rh(I). It was
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12

Knight, Ramisha Spruill. "Visual percepts induced by transcranial magnetic stimulation of the occipital cortex." Doctoral thesis, 2015. http://hdl.handle.net/11562/909419.

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In che modo le persone vedono? In molti risponderebbero “con gli occhi!” In realtà gli occhi rappresentano solamente il primo stadio nell'elaborazione dell’informazione visiva. Questa tesi cerca di incrementare le conoscenze sui processi corticali coinvolti nella percezione visiva. Piuttosto che presentare stimoli visivi, abbiamo utilizzato la TMS sulla corteccia occipitale per indurre dei percetti visivi. Questi percetti, chiamati fosfeni e scotomi, hanno caratteristiche di luminanza ben distinte e quindi dovrebbero simulare la normale elaborazione visiva. Nel primo studio abbiamo testato se
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13

Vorwerg, Michael [Verfasser]. "Der Einfluss von Stromrichtung und Strompulsform der neuronavigierten transkraniellen Magnetstimulation auf die Wahrnehmung von Phosphenen / vorgelegt von Michael Vorwerg." 2010. http://d-nb.info/1004912765/34.

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14

Casel, Claudia [Verfasser]. "Synthese und computerchemische Untersuchung neuer Phosphete und Phosphetidine sowie exemplarischer Übergangsmetallkomplexe beider Substanzklassen / vorgelegt Claudia Casel." 2004. http://d-nb.info/973948108/34.

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15

Bagattini, Chiara. "Neural correlates of visual and spatial awareness." Doctoral thesis, 2014. http://hdl.handle.net/11562/710361.

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Questa tesi di dottorato si focalizza sullo studio sperimentale dei correlati neurali relativi alla percezione visiva e spaziale nell’uomo. Nello specifico, l’obiettivo di questo progetto è quello di identificare i marker elettrofisiologici della consapevolezza, sia in condizioni normali, sia quando la consapevolezza viene persa a causa di una lesione cerebrale reale o “virtuale”. In entrambi gli studi condotti è stato adottato un approccio causale multimodale, ovvero la coregistrazione dell’elettroencefalogramma durante la Stimolazione Magnetica Transcranica (EEG-TMS), che è in grado di forni
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16

MAZZI, Chiara. "The causal role of the intraparietal sulcus (IPS) in visual conscious experience. A TMS investigation." Doctoral thesis, 2012. http://hdl.handle.net/11562/403736.

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Recentemente è stato dimostrato che la Stimolazione Magnetica Transcranica (TMS), applicata anche ad aree diverse da V1, può generare fosfeni. In particolare, sono stati riportati fosfeni in seguito alla stimolazione del Solco Intraparietale (IPS). Tuttavia, non è stato ancora chiarito se i fosfeni parietali siano generati direttamente dalla corteccia parietale indipendentemente dal contributo delle aree occipitali. In primo luogo, è stato svolto un esperimento per confrontare i più comuni metodi di misurazione della soglia di detezione dei fosfeni, dato che la stessa rappresenta il cuore del
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