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Science 23 April 1971:
Vol. 172. no. 3981, pp. 401 - 402
DOI: 10.1126/science.172.3981.401
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Articles

Bispectrum Analysis of Electroencephalogram Signals during Waking and Sleeping

T. P. Barnett 1, L. C. Johnson 2, P. Naitoh 2, N. Hicks 3, and C. Nute 4

1 Westinghouse Electric Corporation, Annapolis, Maryland 21404
2 Navy Medical Neuropsychiatric Research Unit, San Diego, California 92152
3 Westinghouse Electric Corporation, Ocean Research Laboratory, San Diego, California 92121
4 Navy Medical Neuropsychiatric Research Unit, San Diego

The degree of interaction of component waves making up a single electroencephalogram trace was strongly correlated with alpha activity, lead placement, and state of consciousness. Significant quadratic coupling of the waves was found only for awake subjects with high alpha activity. For these subjects about 50 percent of beta activity can be attributed to harmonic coupling with the alpha peak. During sleep, the degree of interaction was of borderline significance and did not follow a consistent pattern with respect to subject, frequency, state, or lead.


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