Intracerebral P3-like waveforms and the length of the stimulus-response interval in a visual oddball paradigm.

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Authors

ROMAN Robert BRÁZDIL Milan JURÁK Pavel REKTOR Ivan KUKLETA Miloslav

Year of publication 2005
Type Article in Periodical
Magazine / Source Clinical Neurophysiology
MU Faculty or unit

Faculty of Medicine

Citation
Field Neurology, neurosurgery, neurosciences
Keywords P3 waveform; ERPs; Intracerebral recordings; Visual oddball paradigm
Description Event-related potentials were recorded from 560 cerebral sites in 17 patients suffering from intractable epilepsy during visual oddball task. Potentials evoked by the target stimuli were sorted according to button-pressing response times, and the P3 waveform was analyzed both in stimulus-locked and response-locked averages, which were separately averaged for fast and slow responses. P3-like waveforms were identified in 180 sites in 17 patients. Three different types of P3-like waveforms, diffusely distributed within the brain, were found: (1) time-locked to the stimulus (30 sites in 11 patients); (2) time-locked to the motor response (52 sites in 13 patients); and (3) with ambiguous time relationship to stimulus and motor response (98 sites in 16 patients). The intracerebral P3-like waveform could represent different processes involved in performing active oddball tasks. Therefore, our results support the hypothesis that the P3 waveform could be a heterogeneous phenomenon.
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