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• W2020244562 abstract "Averaged event-related cortical potentials (ERPs) were obtained from an array of scalp electrodes overlying the left hemicranium in response to regularly presented visual or auditory stimuli (non-signals) and to infrequent random replacements by different stimuli (signals) in the same modality. A delayed motor response was required to the signals. Non-signal ERPs were subtracted from signal ERPs and the topographic distributions of the negative (N2Δ) and positive (P3Δ) components were plotted as isopotential maps. N2Δ distributions differed for the auditory and visual modalities, whereas P3Δ was modality unspecific. These topographic data were compared to those from the previous study of missing stimulus potentials (Simson et al. 1976) using maps representing the contributions from unilateral cerebral sources. The N2Δ and negative missing stimulus potential distributions ascribed to cortical activity within the secondary auditory and visual regions, whereas the late positive component (positive missing stimulus potential or P3Δ) were considered to derive principally from inferior parietal association cortex. Sur un faisceau d'électrodes de scalp recouvrant l'hémicrâne gauche les ERP moyens sont obtenus en réponse à des stimuli visuels ou auditifs présentés régulièrement (non signaux) et à différents stimuli (signaux) de même modalité qui les remplacent de façon peu fréquente et aléatoire. Il est demandé au sujet de répondre aux signaux par une action motrice retardée. Les ERP aux stimuli non-signaux sont soustraits des ERP aux signaux et les distributions topographiques des composantes négatives (N2Δ) et positives (P3Δ) sont relevées sous forme de nappes isopotentielles. Les distributions de N2Δ diffèrent pour les modalités auditive et visuelle, tandis que celles de P3Δ sont non spécifique de la modalité de stimulation. Ces données topographiques sont comparées à celles obtenues, lors d'études antérieures, sur les potentiels aux stimulis manquants (MSP, Simson et al. 1976) à l'aide de nappes représentant les contributions de sources cérébrales unilatérales. Les distributions de N2Δ et NMSP se réfèrent à une activité corticale à l'intérieur des régions visuelles et auditives secondaires tandis que les LPC (PMSP ou P3Δ) paraissent dériver principalement du cortex d'association pariétal inférieur." @default.
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• W2020244562 title "The scalp topography of potentials in auditory and visual discrimination tasks" @default.
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• W2020244562 doi "https://doi.org/10.1016/0013-4694(77)90216-4" @default.
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