Time course of human 40 Hz EEG activity accompanying P3 responses in an auditory oddball paradigm

In order to quantify the time course of auditory P3-related gamma activity, root mean square (RMS) values were calculated from band-filtered (30–45 Hz) target and non-target responses in an auditory oddball experiment. Evoked (phase locked) gamma activity was evaluated from the time domain averages,...

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Bibliographic Details
Published in:Neuroscience letters 1997-10, Vol.235 (3), p.121-124
Main Authors: Fell, Jürgen, Hinrichs, Hermann, Röschke, Joachim
Format: Article
Language:English
Subjects:
Acoustic Stimulation
Adult
Analysis of Variance
Biological and medical sciences
Central nervous system
Electroencephalography
Electrophysiology
Evoked activity
Evoked Potentials, Auditory - physiology
Female
Fundamental and applied biological sciences. Psychology
Gamma activity
Humans
Induced activity
Male
Middle Aged
Single trial analysis
Time Factors
Transient response
Vertebrates: nervous system and sense organs
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Summary:In order to quantify the time course of auditory P3-related gamma activity, root mean square (RMS) values were calculated from band-filtered (30–45 Hz) target and non-target responses in an auditory oddball experiment. Evoked (phase locked) gamma activity was evaluated from the time domain averages, whereas induced (not necessarily phase locked) activity was analyzed on the basis of single trials. Gamma RMS values were integrated across different time windows, namely the prestimulus, N50/P50, N100, pre P3, P3 and post P3 window. The single trial P3 window hereby was defined by a maximum amplitude criterion. In accordance with other studies, we found a pronounced increase of evoked gamma activity in the time window up to 80 ms after stimulus onset. In contrast, induced gamma activity as revealed by single trial analysis decreased markedly after stimulus presentation. Starting with the P3 window, induced activity recovered to baseline level for the non-target trials, whereas it remained significantly suppressed for the target responses.
ISSN:0304-3940
1872-7972
DOI:10.1016/S0304-3940(97)00730-1