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Neural Correlates of Conscious and Unconscious Vision in Parietal Extinction 

Authors: Geraint Rees;  Ewa Wojciulik;  Karen Clarke;  Masud Husain;  Chris Frith; Jon Driver
DOI: 10.1076/neur.8.4.387.16190
Publication Frequency: 6 issues per year
Published in: journal Neurocase, Volume 8, Issue 5 October 2002 , pages 387 - 393
Formats available: PDF (English)
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Abstract

Brain areas activated by stimuli in the left visual field of a right parietal patient suffering from left visual extinction were identified using event-related functional magnetic resonance imaging. Left visual field stimuli that were extinguished from awareness still activated the ventral visual cortex, including areas in the damaged right hemisphere. An extinguished face stimulus on the left produced robust category-specific activation of the right fusiform face area. On trials where the left visual stimulus was consciously seen rather than extinguished, greater activity was found in the ventral visual cortex of the damaged hemisphere, and also in frontal and parietal areas of the intact hemisphere. These findings extend recent observations on visual extinction, suggesting distinct neural correlates for conscious and unconscious perception.
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