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*** between interocular correlation sensitivity and stereoscopic vision

Annals of Eye Science 2018年第1期 480-480页

作者： alexandre reynaud Robert F.Hess Department of Ophthalmology McGill Vision ResearchMcGill UniversityMontréalQCCanada

Background:Stereoscopic Vision uses the disparity between the two images received by the two eyes in order to create a tridimensional *** this study,we aimed at providing an estimate of binocular vision at a level prior to disparity *** particular,we wanted to assess the spatial properties of the visual system for detecting interocular correlations(IOC).Methods:We developed dichoptic stimuli,made of textures which IOC is sinusoidally modulated at various correlation spatial ***,we compared the sensitivity to these stimuli to the sensitivity to analogous stimuli with disparity ***:We observed that IOC sensitivity presents a low-pass/band-pass profile and increases as a function of presentation duration and contrast,in a similar way as disparity ***:IOC sensitivity is weakly-though significantly-correlated with disparity sensitivity in the general population,which suggests that it could provide a marker for binocular vision,prior to disparity processing.

关键词： Binocular vision interocular correlation(IOC) stereoscopy psychophysics

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*** effects of monocular deprivation on the Pulfrich phenomenon

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Annals of Eye Science 2019年第1期 188-188页

作者： Sasha Novozhilova alexandre reynaud Robert F.Hess Department of Ophthalmology and Visual Science McGill UniversityMontrealQCCanada

Background:Short term monocular deprivation allows for the modulation of ocular dominance,such that the previously deprived eye contribution will increase,while that of non-deprived eye will *** study examines the effects of short monocular occlusion on the Pulfrich phenomenon,an illusory perception of a horizontally moving object moving in an elliptical orbit in *** addition,we will explore whether the modulation of the Pulfrich effect is produced in the magnocellular pathway or the parvocellular pathway,by comparing two protocols,each designed to activate one pathway at a ***:The stimulus used throughout the experiment is made up of elements defining a cylinder rotating in depth,allowing to measure interocular *** task consists of reporting the direction of rotation of the stimulus *** are two different stimuli:the P stimulus is composed of small elements oscillating slowly,which stimulates the parvocellular pathway,and the M stimulus which is composed of large elements oscillating rapidly which stimulates the magnocellular *** experimental session consists of pre-patch testing,one hour of patching,and a post-patch *** participant performs four sessions,both stimuli for each ***:The point of subjective equivalence(PSE)is extracted from psychometric functions obtained during pre-testing and *** deprivation of the left eye the PSE shifts negatively,whereas deprivation of the right eye shifts the PSE positively on the psychometric *** indicated that monocular deprivation slows the perceptual processes of the previously patched *** amplitude of this effect is larger for the M protocol than it is for the P ***:Contrary to expectations,results showed that effects of monocular deprivation are not exclusively mediated by contrast gain mechanisms,as suggested by Zhou and colleagues(2014).The amplitude of the differences observed for the M protocole suggest t

关键词： Monocular deprivation plasticity Pulfrich phenomenon binocular vision

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AB066. Duration dependent visual plasticity via monocular deprivation

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Annals of Eye Science 2018年第1期 472-472页

作者： Seung Hyun Min Alex Baldwin alexandre reynaud Robert F.Hess Department of Ophthalmology McGill Vision ResearchMcGill UniversityMontrealQCCanada

Background:Short-term monocular deprivation has been recently shown to temporarily increase the sensitivity of the patched *** studies have patched subjects for an arbitrary period of 2.5 hours,but for no principled *** goal is to show a relationship,if any,between the length of patching duration and the strength of its ***:We tested nine subjects with three different patching durations:1-,2-,*** of the nine subjects were patched for *** deprivation was achieved by the use of a translucent eyepatch.A session included two rounds of baseline testing of interocular eye balance,patching,and post-patching *** post-patching test occurred at 0,3,6,12,24,48,60 and 96 minutes after patching to track the patching effect over *** subject performed two sessions per ***:One-hour patching produced a small shift in ocular dominance.A larger shift occurred from 2-hour patching,but 3-hour patching produced a comparable effect to the one measured after 2-hour ***:These results show a saturation of the patching effect beyond 2-hour ***,we believe that 2-hour patching duration is the optimal duration for eye dominance changes induced by monocular deprivation.

关键词： Neuroplasticity ocular dominance monocular deprivation

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*** normalization in monkey primary visual cortex(V1)

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Annals of Eye Science 2019年第1期 190-190页

作者： alexandre reynaud Sébastien Roux Sandrine Chemla Frédéric Chavane Robert F.Hess McGill Vision Research Department of Ophthalmology and Visual SciencesMcGill UniversityMontrealQCCanada Institut de Neurosciences de la Timone Centre national de la recherche scientifique(CNRS)MarseilleFrance Aix-Marseilles Université MaseilleFrance UniversitéPaul Sabatier Toulouse III ToulouseFrance

Background:The two images,slightly different,seen by the two eyes allow the brain to build a 3D representation of the *** signals enter the primary visual cortex through layer 4,where they are segregated and organized in ocular dominance *** are later combined in upper *** order to study the integration of the information coming from the two eyes at this mesoscopical scale in V1,we use optical imaging in anaesthetized macaque ***:Ocular dominance maps have been obtained with intrinsic optical *** interactions have then been studied with voltage-sensitive dye imaging(VSDI)with a frequency-tagging *** stimuli with different contrasts were respectively presented at 6 and 10 Hz to the two eyes,independently or simultaneously with a passive 3D *** analysis thus allowed to identify each eye’s contribution to the ***:We observed that V1 population activity generated by one eye stimulation is suppressed when the other eye is stimulated *** integration of monocular signals at the population level can be accurately modeled with an interocular normalization ***:This approach and this model confirm V1 implication in combining the signals coming from the two *** mechanisms underlying this interocular normalization,through local,feedforward,feedback or long-range connections,are still to be determined.

关键词： Binocular vision macaque monkey normalisation optical imaging

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