Primary Visual Cortex: Awareness and Blindsight
نویسندگان
چکیده
منابع مشابه
Primary visual cortex: awareness and blindsight.
The primary visual cortex (V1) is the principal telencephalic recipient of visual input in humans and monkeys. It is unique among cortical areas in that its destruction results in chronic blindness. However, certain patients with V1 damage, though lacking visual awareness, exhibit visually guided behavior: blindsight. This phenomenon, together with evidence from electrophysiological, neuroimagi...
متن کاملWhy is “blindsight” blind? A new perspective on primary visual cortex, recurrent activity and visual awareness
The neuropsychological phenomenon of blindsight has been taken to suggest that the primary visual cortex (V1) plays a unique role in visual awareness, and that extrastriate activation needs to be fed back to V1 in order for the content of that activation to be consciously perceived. The aim of this review is to evaluate this theoretical framework and to revisit its key tenets. Firstly, is blind...
متن کاملPrimary visual cortex and visual awareness.
The primary visual cortex (V1) is probably the best characterized area of primate cortex, but whether this region contributes directly to conscious visual experience is controversial. Early neurophysiological and neuroimaging studies found that visual awareness was best correlated with neural activity in extrastriate visual areas, but recent studies have found similarly powerful effects in V1. ...
متن کاملBlindsight, conscious vision, and the role of primary visual cortex.
What is the role the primary visual cortex (V1) in vision? Is it necessary for conscious sight, as indicated by the cortical blindness that results from V1 destruction? Is it even necessary for blindsight, the nonreflexive visual functions that can be evoked with stimuli presented to cortically blind fields? In the context of this controversial issue, I present evidence indicating that not only...
متن کاملA re-evaluation of blindsight and the role of striate cortex (V1) in visual awareness.
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 experience1 (Pöppel, Held, & Frost, 1973; Weiskranz, Warrington, Sanders, & Marshall, 1974; see Cowey, 2004 for a review). This phenomenon, known as blindsight (Weiskranz et al., 1974) strongly...
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ژورنال
عنوان ژورنال: Annual Review of Neuroscience
سال: 2012
ISSN: 0147-006X,1545-4126
DOI: 10.1146/annurev-neuro-062111-150356