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Motion processing in autism: atypical bounded integration

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Many studies have pointed to a coherent motion perception deficit in autism spectrum conditions (ASC). We examine this deficit in light of electrophysiological research on the neural circuit that integrates motion signals towards a perceptual decision (Shadlen, 1996). An essential feature of this bounded accumulation is time: it takes time for initial variability in motion evidence to stabilize and reach a critical decision bound. As a result, parametric variation of viewing duration is a key experimental manipulation for uncovering the roots of coherent motion perception deficits in ASC . Preliminary fMRI analyses of an event-related study examining motion integration in ASC will also be discussed.

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