Pattern visual evoked potentials recorded from human occipital cortex with chronic subdural electrodes |
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| Institution: | 1. Department of Psychology, Effat University, Jeddah, Saudi Arabia;2. School of Psychological Sciences, University of Northern Colorado, Greeley, CO 80639, USA;1. Department of Child Neurology, National Center Hospital, National Center of Neurology and Psychiatry, 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo 187-8551, Japan;2. Department of Developmental Disorders, National Institute of Mental Health, National Center of Neurology and Psychiatry, 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo 187-8553, Japan;3. Department of Neurosurgery, National Center Hospital, National Center of Neurology and Psychiatry, 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo 187-8551, Japan;4. Cognitive Brain Research Unit (CBRU), Faculty of Medicine, University of Helsinki, Haartmaninkatu 3, FI-00290 Helsinki, Finland;5. Mori Arinori Center for Higher Education and Global Mobility, Hitotsubashi University, 2-1, Kunitachi, Tokyo 186-8601, Japan;1. Hawaii Natural Energy Institute, University of Hawaii, Honolulu, HI 96822, USA;2. Chemical & Biological Engineering Department, UNM Center for Micro-Engineered Materials, University of New Mexico, Albuquerque, NM 87131, USA;3. Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;1. Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California;2. Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California;1. Department of Clinical Neurophysiology, King’s College Hospital, London, UK;2. Department of Neurosurgery, King’s College Hospital, London, UK;3. King’s College London & Guy’s and St Thomas’ PET Centre, School of Biomedical Engineering and Imaging Sciences, King''s College London, London, UK;4. Department of Neuroradiology, King''s College Hospital, London, UK;5. Department of Basic and Clinical Neuroscience, Institute of Psychiatry, Psychology and Neuroscience, King''s College London, London, UK;6. Department of Paediatric Neurosciences, King’s College Hospital, London, UK |
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| Abstract: | Pattern evoked potentials to full- and partial-field stimulation were recorded simultaneously from scalp electrodes and from subdural electrodes located over the temporal and occipital cortex, including electrodes placed over or close to the lower lip of the calcarine fissure. High-amplitude pattern evoked potentials were recorded exclusively from electrodes localized in the vicinity of the calcarine fissure and showed a positive-negative deflection in phase with surface recordings, followed by a second negative peak phase reversed with respect to the major surface positive peak (“P100”). The findings suggest that the initial component is an expression of the afferent volley and that the second component (equivalent of the surface “P100”) is most probably generated as a dipole strictly localized to the visual cortex in close proximity of the calcarine fissure (area 17 and/or area 18). |
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