An investigation of the event-related slow-wave potential (0.01-2 Hz) in normal children

Author(s): Barry, R. J.

Journal/Book: Int J Psychophysiol. 1999; 32: PO Box 211, 1000 AE Amsterdam, Netherlands. Elsevier Science Bv. 15-34.

Abstract: Previous research has indicated that the auditory ERPs of children are dominated by a frontal negative slow-wave. This paper outlines a preliminary attempt to separate event-related low-frequency activity from traditional ERP components as found in older subjects. An active auditory oddball task was completed by 30 normal children aged from 8 to 18 years, and ERPs to target and standard stimuli were derived. The original ERP files were digitally filtered to calculate separate ERPs containing only 0.01-2 Hz activity (termed the SW-ERP) or 2-12 Hz activity (termed the RESIDUAL ERP) for each subject. The SW-ERP was maximally correlated with the slow-wave factor from a principal components analysis of the original target and standard waveforms. The SW-ERPs to target stimuli contained an early negative component which showed an age-related decrease, and a late positive component which did not. The SW-ERP was found to be partly responsible for the differences in component amplitude and morphology between sites observed in the raw ERPs.

Note: Article Johnstone SJ, Univ Wollongong, Dept Psychol, Wollongong, NSW 2522, AUSTRALIA

Keyword(s): auditory ERP; slow-wave; delta activity; children; development; time-frequency; AUDITORY-EVOKED POTENTIALS; REACTION-TIME; ODDBALL TASK; P300; FREQUENCY; COMPONENTS; LATENCY; STIMULI; EEG; DISCRIMINATION

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