title: Neural correlates of conscious and unconscious vision in parietal extinction.
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.
authors.affiliation: Institute of Cognitive Neuroscience, University College London, 17 Queen Square, London WC1N 3AR, UK. g.rees@fil.ion.ucl.ac.uk
authors.forename: Geraint
authors.initials: G
authors.lastname: Rees
authors.forename: Ewa
authors.initials: E
authors.lastname: Wojciulik
authors.forename: Karen
authors.initials: K
authors.lastname: Clarke
authors.forename: Masud
authors.initials: M
authors.lastname: Husain
authors.forename: Chris
authors.initials: C
authors.lastname: Frith
authors.forename: Jon
authors.initials: J
authors.lastname: Driver
mesh_terms: D000368:Aged; D001364:Awareness / Q000502:physiology*; D001925:Brain Damage, Chronic / Q000175:diagnosis / Q000503:physiopathology*; D002544:Cerebral Infarction / Q000175:diagnosis / Q000503:physiopathology; D004292:Dominance, Cerebral / Q000502:physiology*; D005108:Extinction, Psychological / Q000502:physiology*; D005500:Follow-Up Studies; D006423:Hemianopsia / Q000175:diagnosis / Q000503:physiopathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009483:Neuropsychological Tests; D010296:Parietal Lobe / Q000473:pathology / Q000503:physiopathology*; D010468:Perceptual Disorders / Q000175:diagnosis / Q000503:physiopathology