David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
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Some patients with a lesion to the striate cortex (V1), when assessed through forced-choice paradigms, are able to detect stimuli presented in the blind field, despite reporting a complete lack of visual experience. This phenomenon, known as blindsight, strongly implicates V1 in visual awareness. However, the view that V1 is indispensable for conscious visual perception is challenged by a recent finding that the blindsight subject GY can be aware of visual qualia in his blind field, implying that V1may not be critical under all circumstances. This apparent contradiction raises the following question: if V1 is not always necessary for phenomenal awareness, why do V1 lesions have such a detrimental effect on conscious perception? It is suggested here that this contradiction can be resolved by considering the impact of V1 lesions on the functioning of the whole visual cortex.
|Keywords||blindsight primary visual cortex transcranial magnetic stimulation|
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Berit Brogaard (2011). Conscious Vision for Action Versus Unconscious Vision for Action? Cognitive Science 35 (6):1076-1104.
Doerthe Seifert, Christine Falter, Hans Strasburger & Mark A. Elliott (2010). Bandpass Characteristics of High-Frequency Sensitivity and Visual Experience in Blindsight. Consciousness and Cognition 19 (1):144-151.
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