David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Ezio Di Nucci
Jonathan Jenkins Ichikawa
Jack Alan Reynolds
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Philosophical Psychology 24 (6):767 - 786 (2011)
Blindsight, the ability to blindly discriminate wavelength and other aspects of stimuli in a blind field, sometimes occurs in people with lesions to striate (V1) cortex. There is currently no consensus on whether qualitative color information of the sort that is normally computed by double opponent cells in striate cortex is indeed computed in blindsight but doesn?t reach awareness, perhaps owing to abnormal neuron responsiveness in striate or extra-striate cortical areas, or is not computed at all. The existence of primesight, the experience of colored afterimages in blindsight, has been taken to suggest that qualitative color information is computed either in pre-striate or striate cortical areas but is not broadcast to working memory. I argue here that a recent study in which color phosphenes were induced in a blindsighter using bilateral transcranial magnetic stimulation indicates that computations necessary for conscious color vision are lost in blindsight. Owing to this loss, the neural responsiveness in extrastriate cortical areas is abnormal and hence is unable to give rise to color awareness. Blindsight is thus degraded vision in which the computations necessary for conscious color vision have been lost
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Citations of this work BETA
Berit Brogaard (2015). Type 2 Blindsight and the Nature of Visual Experience. Consciousness and Cognition 32:92-103.
Robert Foley (2015). The Case for Characterising Type-2 Blindsight as a Genuinely Visual Phenomenon. Consciousness and Cognition 32:56-67.
Berit Brogaard, Kristian Marlow & Kevin Rice (2014). Unconscious Influences on Decision Making in Blindsight. Behavioral and Brain Sciences 37 (1):22-23.
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