Carnegie Mellon University
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Freud_Behrmann_final_version.pdf (2.61 MB)

Fred_Behrmann_final_version

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preprint
posted on 2020-05-11, 22:39 authored by Erez FreudErez Freud, Marlene BehrmannMarlene Behrmann
preprint of the paper. abstract:
Recent findings suggest that both dorsal and ventral visual pathways process shape information.
Nevertheless, a lesion to the ventral pathway alone can result in visual agnosia, an impairment in
shape perception. Here, we explored the neural basis of shape processing in a patient with visual
agnosia following a circumscribed right hemisphere ventral lesion and evaluated longitudinal
changes in the neural profile of shape representations. The results revealed a reduction of shape
sensitivity slopes along the patient’s right ventral pathway and a similar reduction in the
contralesional left ventral pathway. Remarkably, posterior parts of the dorsal pathway bilaterally
also evinced a reduction in shape sensitivity. These findings were similar over a two-year
interval, revealing that a focal cortical lesion can lead to persistent large-scale alterations of the
two visual pathways. These alterations are consistent with the view that a distributed network of
regions contributes to shape perception.

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