A Dichotomous Visual Brain? by Marc Jeannerod
نویسنده
چکیده
Recent experiments in normal subjects using neuroimaging demonstrate that the dorsal cortico-cortical pathway is involved during purely perceptual activities. Pathological cases with right posterior parietal lesions show deficits in visuospatial perception. It is argued that the radical dichotomy between perception and action pathways, as heralded in Milner and Goodale's book should be reexamined. The idea of distributed networks using resources in both visual pathways and recruited as a function of task demands is presented. The Milner and Goodale model of the visual functions of cerebral cortex is based on binary reasoning. Accordingly, the model puts forward the case that the output of the visual cortex is chanelled into two anatomical pathways which account for two modalities of functioning and so ends up with two distinct outcomes: activation of the dorsal cortical pathway generates automatic, unconscious action; whereas activation of the ventral pathway generates conscious perception (see Milner & Goodale, 1995). My point will be that such dichotomies may represent oversimplifications and may even be revealled to be
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