Mr. David B. Chorlian Profile

David B. Chorlian

at SUNY/HSCB/Neurodynamics Lab

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Proceedings Article | 1 April 2003 Paper

Determination of human EEG alpha entrainment ERD/ERS using the continuous complex wavelet transform

David Chorlian, Bernice Porjesz, Henri Begleiter

Proceedings Volume 5102, (2003) https://doi.org/10.1117/12.485937

KEYWORDS: Wavelets, Wavelet transforms, Electroencephalography, Phase shift keying, Frequency modulation, Phase measurement, Continuous wavelet transforms, Brain, Electrodes, Spectral resolution

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Alpha entrainment caused by exposure to a background stimulus continuously flickering at a rate of 8 1/3 Hz was affected by the appearance of a foreground target stimulus to which the subjects were requested to press a button. With the use of bipolar derivations (to reduce volume conduction effects), scalp recorded EEG potentials were subjected to a continuous wavelet transform using complex Morlet wavelets at a range of scales. Complex Morlet wavelets were used to calculate efficiently instantaneous amplitudes and phases on a per-trial basis, rather than using the Hilbert transform on band-pass filtered data. Multiple scales were employed to contrast the pattern of alpha activity with those in other bands, and to determine whether the harmonics observed in the spectral analysis of the data were simply a result of the non-sinusoidal response to the entraining signal or a distinct neural phenomenon. We were thus able to calculate desynchronization/resynchronization for both the entrained and non-entrained alpha activity. The occurance of the target stimulus caused a sharp increase in amplitude in both the entrained and non-entrained alpha activity, followed by a sharp decrease, and then a return to baseline, over a period of 2.5 seconds. However, the entrained alpha activity showed a much more rapid recovery than non-entrained activity.

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