Functionally Independent Components of the Late Positive Event-Related Potential During Visual Spatial Attention

摘要

Human event-related potentials (ERPs) were recorded from 10 subjects presented with visual target and nontarget stimuli at five screen locations and responding to targets presented at one of the locations. The late positive response complexes of 25-75 ERP average waveforms from the two task conditions were simultaneously analyzed with independent Component Analysis, a new computational method for blindly separating linearly mixed signals. Three spatially fixed, temporarily independent, behaviorally relevant, and physiologically plausible components were identified without reference to peeks in single-channel waveforms.