Silvanto, J and REES, G (2011) What does neural plasticity tell us about role of primary visual cortex (V1) in visual awareness? Frontiers in Psychology , 2 (Jan) , Article 6. 10.3389/fpsyg.2011.00006.
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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.
|Title:||What does neural plasticity tell us about role of primary visual cortex (V1) in visual awareness?|
|Open access status:||An open access publication. A version is also available from UCL Discovery.|
|Additional information:||Copyright: © 2011 Silvanto and Rees. This is an open-access publication subject to an exclusive license agreement between the authors and the Frontiers Research Foundation, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are credited. Article appears in Frontiers in Consciousness Research, which is a Specialty Section of Frontiers in Psychology|
|UCL classification:||UCL > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Neurology > Imaging Neuroscience|
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