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The Superior Colliculus Is Sensitive to Gestalt-like Stimulus Configuration in Hemispherectomy Patients by Loraine Georgy; Alessia Celeghin; Carlo A. Marzi; Marco Tamietto; Alain Ptito is a Neuroscience article available to read on EtoBox.

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Patients with cortical blindness following a lesion to the primary visual cortex (V1) may retain nonconscious visual abilities (blindsight). One intriguing, though largely unexplored question, is whether nonconscious vision in the blind hemifield of hemianopic patients can be sensitive to higher-order perceptual organization, and which V1-independent structure underlies such effect. To answer this question, we tested two rare hemianopic patients who had undergone hemispherectomy, and in whom the only post-chiasmatic visual structure left intact in the same side of the otherwise damaged hemisphere was the superior colliculus (SC). By using a variant of the redundant target effect (RTE), we presented single dots, patterns composed by the same dots organized in quadruple gestalt-like configurations, or patterns of four dots arranged in random configurations, either singly to the intact visual hemifield or bilaterally to both hemifields. As reported in a number of prior studies on blindsight patients, we found that bilateral stimulation yielded faster reaction times (RTs) than single stimulation of the intact field for all conditions (i.e., there was an implicit RTE). In addition to th

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Author

Loraine Georgy; Alessia Celeghin; Carlo A. Marzi; Marco Tamietto; Alain Ptito

Publisher

Elsevier BV

Published

2016

Language

EN

Field

Neuroscience (Life Sciences)