Transient Inability to Distinguish Between Faces: Electrophysiologic Studies
| Autor: | Jean-Paul Spire, Stephen J. Uftring, Hugh W. Wilson, Vernon L. Towle, Alexander G. Dimitrov, Ivan J. Torres, Robert K. Erickson, Charles A. Pelizzari, Trevor Mundel, John Milton |
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| Rok vydání: | 2003 |
| Předmět: |
Adult
medicine.medical_specialty Time Factors Physiology Face Presentation Audiology Right temporal lobe Face perception Physiology (medical) medicine Humans Brain Mapping Communication Fusiform gyrus business.industry Electroencephalography Magnetic Resonance Imaging Temporal Lobe Epileptic aura Electrodes Implanted Electrophysiology Face discrimination Prosopagnosia Epilepsy Temporal Lobe Pattern Recognition Visual Neurology Face Evoked Potentials Visual Female Neurology (clinical) Subdural electrodes Psychology business |
| Zdroj: | Journal of Clinical Neurophysiology. 20:102-110 |
| ISSN: | 0736-0258 |
| Popis: | It is not known with certainty at which level of face processing by the cortex the distinction between a familiar and an unfamiliar face is made. Subdural electrodes were implanted under the fusiform gyrus of the right temporal lobe in a patient who developed an unusual inability to distinguish differences between faces as part of the epileptic aura ("all faces looked the same"). A cortical region located posterior to the epileptic focus was identified that exhibited a maximum evoked response to the presentation of facial images (N165), but not to objects, scenes, or character strings. Evoked potentials elicited by a variety of visual images indicated that any perturbation away from novel whole-face stimuli produced submaximal responses from this region of the right temporal lobe. Electrical stimulation of this region resulted in an impairment of face discrimination. It was found that presentation of familiar faces (grandmother, treating physician) produced a different response from that observed for novel faces. These observations demonstrate that within 165 msec of face presentation, and before the conscious precept of face familiarity has formed, this cortical region has already begun to distinguish between a familiar and an unfamiliar face. |
| Databáze: | OpenAIRE |
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