Gamma band activity in an auditory oddball paradigm studied with the wavelet transform

To examine the characteristics of evoked and induced gamma band oscillatory responses occurring during P300 development in an auditory oddball paradigm. A time-frequency analysis method was applied to an auditory oddball paradigm in 7 healthy subjects. This method combines a multiresolution wavelet...

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Bibliographic Details
Published in:Clinical neurophysiology 2001-07, Vol.112 (7), p.1219-1228
Main Authors: GURTUBAY, I. G, ALEGRE, M, LABARGA, A, MALANDA, A, IRIARTE, J, ARTIEDA, J
Format: Article
Language:English
Subjects:
Acoustic Stimulation
Adult
Algorithms
Behavioral psychophysiology
Biological and medical sciences
Electroencephalography - methods
Electroencephalography - statistics & numerical data
Electrophysiology
Event-Related Potentials, P300 - physiology
Evoked Potentials, Auditory - physiology
Female
Fundamental and applied biological sciences. Psychology
Humans
Male
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
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Summary:To examine the characteristics of evoked and induced gamma band oscillatory responses occurring during P300 development in an auditory oddball paradigm. A time-frequency analysis method was applied to an auditory oddball paradigm in 7 healthy subjects. This method combines a multiresolution wavelet algorithm for signal extraction and the Gabor transform to represent the temporal evolution of the selected frequency components. Phase-locked or evoked activity and also non-phase-locked activity were computed for both standard and target stimuli. The gamma band frequency components differed between target and non-target stimuli processing. The study showed an early and mainly phase-locked oscillatory response appearing around 26--28 ms after both standard and target stimuli onset. This response showed a spectral peak around 44 Hz for both stimuli. A late oscillatory activity peaking at 37 Hz with a latency around 360 ms was observed appearing only for target stimuli. The latency of this late oscillatory activity had a high correlation (P=0.002) to the latency of the P300 wave. EEG signal analysis with wavelet transform allows the identification of an early oscillatory cortical response in the gamma frequency range, as well as a late P300-related response.
ISSN:1388-2457
1872-8952
DOI:10.1016/S1388-2457(01)00557-0