What does neural plasticity tell us about role of primary visual cortex (V1) in visual awareness?

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What does neural plasticity tell us about role of primary visual cortex (V1) in visual awareness? / Silvanto, Juha; Rees, Geraint.

In: Frontiers in Psychology, Vol. 2, 6, 2011, p. 1-5.

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@article{8972561657664c0ba42092b123c5c89b,
title = "What does neural plasticity tell us about role of primary visual cortex (V1) in visual awareness?",
abstract = "The complete loss of visual awareness resulting from a lesion to the primary visual cortex (V1) suggests that this region is indispensable for conscious visual perception. There are however a number cases of conscious perception in the absence of V1 which appear to challenge this conclusion. These include reports of patients with bilateral V1 lesions sustained at an early age whose conscious vision has spontaneously recovered, as well as stroke patients who have recovered some conscious vision with the help of rehabilitation programs. In addition, the phenomenon of hemianopic completion and percepts induced by brain stimulation suggest that V1 may not be necessary for conscious perception in all circumstances. Furthermore, that the visual abilities in the cat are associated with the recovery of normal extrastriate tuning properties rather than emulation of V1 functions suggests that there is nothing unique about the functional properties of this region in visual awareness. Rather, the dramatic effect of a V1 lesion on visual awareness may be due to its role in providing the majority of extrastriate visual input, the loss of which abolishes normal neural responsiveness throughout the visual cortex.",
keywords = "Blindsight, Consciousness, Extrastriate, Plasticity, Transcranial magnetic stimulation, V1, Visual awareness",
author = "Juha Silvanto and Geraint Rees",
year = "2011",
doi = "10.3389/fpsyg.2011.00006",
language = "English",
volume = "2",
pages = "1--5",
journal = "Frontiers in Psychology",
issn = "1664-1078",

}

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TY - JOUR

T1 - What does neural plasticity tell us about role of primary visual cortex (V1) in visual awareness?

AU - Silvanto, Juha

AU - Rees, Geraint

PY - 2011

Y1 - 2011

N2 - The complete loss of visual awareness resulting from a lesion to the primary visual cortex (V1) suggests that this region is indispensable for conscious visual perception. There are however a number cases of conscious perception in the absence of V1 which appear to challenge this conclusion. These include reports of patients with bilateral V1 lesions sustained at an early age whose conscious vision has spontaneously recovered, as well as stroke patients who have recovered some conscious vision with the help of rehabilitation programs. In addition, the phenomenon of hemianopic completion and percepts induced by brain stimulation suggest that V1 may not be necessary for conscious perception in all circumstances. Furthermore, that the visual abilities in the cat are associated with the recovery of normal extrastriate tuning properties rather than emulation of V1 functions suggests that there is nothing unique about the functional properties of this region in visual awareness. Rather, the dramatic effect of a V1 lesion on visual awareness may be due to its role in providing the majority of extrastriate visual input, the loss of which abolishes normal neural responsiveness throughout the visual cortex.

AB - The complete loss of visual awareness resulting from a lesion to the primary visual cortex (V1) suggests that this region is indispensable for conscious visual perception. There are however a number cases of conscious perception in the absence of V1 which appear to challenge this conclusion. These include reports of patients with bilateral V1 lesions sustained at an early age whose conscious vision has spontaneously recovered, as well as stroke patients who have recovered some conscious vision with the help of rehabilitation programs. In addition, the phenomenon of hemianopic completion and percepts induced by brain stimulation suggest that V1 may not be necessary for conscious perception in all circumstances. Furthermore, that the visual abilities in the cat are associated with the recovery of normal extrastriate tuning properties rather than emulation of V1 functions suggests that there is nothing unique about the functional properties of this region in visual awareness. Rather, the dramatic effect of a V1 lesion on visual awareness may be due to its role in providing the majority of extrastriate visual input, the loss of which abolishes normal neural responsiveness throughout the visual cortex.

KW - Blindsight

KW - Consciousness

KW - Extrastriate

KW - Plasticity

KW - Transcranial magnetic stimulation

KW - V1

KW - Visual awareness

UR - http://www.scopus.com/inward/record.url?scp=82455191364&partnerID=8YFLogxK

U2 - 10.3389/fpsyg.2011.00006

DO - 10.3389/fpsyg.2011.00006

M3 - Article

VL - 2

SP - 1

EP - 5

JO - Frontiers in Psychology

JF - Frontiers in Psychology

SN - 1664-1078

M1 - 6

ER -

ID: 12959363