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.
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