The late positive component of the auditory evoked potential in a shared reading and counting task

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Abstract Eight subjects were presented with a series of low and high tones. When they were instructed to ignore the tones and perform a reading task, the late positive component (LPC) of the evoked EEG was absent. Both tones, however, produced LPCs when S counted the higher tone, with the counted tone showing greater LPC amplitude. Under a shared reading and counting task, LPC amplitudes were reduced and comparable to those observed in the read-only condition. These results were interpreted as most consistent with a selective attention hypothesis of the LPC.