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    Functional magnetic resonance imaging and evoked potential correlates of conscious and unconscious vision in parietal extinction patients

    Driver, J. and Vuilleumier, P. and Eimer, Martin and Rees, G. (2001) Functional magnetic resonance imaging and evoked potential correlates of conscious and unconscious vision in parietal extinction patients. NeuroImage 14 (1), S68-S75. ISSN 1053-8119.

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    Abstract

    We describe recent functional magnetic resonance imaging (fMRI) and event-related potential (ERP) studies of visual extinction in patients with right parietal damage who can detect isolated visual stimuli on either side, yet often miss contralesional (left) stimuli during bilateral stimulation. We consider the neural fate of such extinguished visual stimuli and how neural responses differ for consciously detected versus extinguished stimuli. fMRI findings indicate that extinguished stimuli evoke activity in striate and ventral extrastriate visual cortex, despite escaping awareness. Activations for extinguished stimuli can be found even in category-specific (face-responsive) areas of the fusiform gyrus. On the other hand, activations in visual cortex are stronger for consciously detected versus extinguished stimuli, with parietal and frontal areas of the intact left hemisphere also implicated in this comparison. Recent ERP data likewise suggest differential neural responses for consciously detected versus extinguished stimuli. We discuss these findings in relation to current speculations about the neural basis of conscious and unconscious perception.

    Metadata

    Item Type: Article
    School: Birkbeck Schools and Departments > School of Science > Psychological Sciences
    Depositing User: Sarah Hall
    Date Deposited: 10 Dec 2019 09:19
    Last Modified: 16 Jan 2020 12:05
    URI: http://eprints.bbk.ac.uk/id/eprint/30229

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