PSYCH-UA 25 Lecture Notes - Autism Spectrum, Repeated Measures Design, Face Perception
21 Nov 2013
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The journal of neuroscience, may 8, 2013 33(19):8243 8249 8243. Jennifer h. foss-feig,1* duje tadin,3* kimberly b. schauder,4 and carissa j. cascio2,4. 1department of psychology and human development, and 2vanderbilt kennedy center, vanderbilt university, nashville, tennessee 37203, 3center for. Visual science, department of brain and cognitive sciences and department of ophthalmology, university of rochester, rochester, new york 14627, and. 4department of psychiatry, vanderbilt university, nashville, tennessee 37212. Atypical perceptual processing in autism spectrum disorder (asd) is well documented. In addition, growing evidence supports the hypothesis that an excitatory/inhibitory neurochemical imbalance might underlie asd. Here we investigated putative behavioral conse- quences of the excitatory/inhibitory imbalance in the context of visual motion perception. As stimulus size increases, typical observers exhibit marked impairments in perceiving motion of high-contrast stimuli. This result, termed spatial suppression, is believed to reflect inhibitory motion-processing mechanisms. Motion processing is also affected by gain control, an inhibitory mechanism that underlies saturation of neural responses at high contrast.
