theta rhythm(redirected from Thetawaves)
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theta rhythm[′thād·ə ‚rith·əm]
A brain rhythm having a frequency of about 4-7 hertz, and somewhat greater voltage than the alpha rhythm; thought to originate in the hippocampus.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.