Open AccessRelationship Between Hippocampal Theta-Wave Frequency and Emotional Behaviors in Rabbits Produced With Stresses or Psychotropic Drugs
Author(s) -
Jyunji Yamamoto
Publication year - 1998
Publication title -
japanese journal of pharmacology/japanese journal of pharmacology
Language(s) - English
Resource type - Journals
eISSN - 1347-3506
pISSN - 0021-5198
DOI - 10.1254/jjp.76.125
Subject(s) - hippocampal formation , theta rhythm , emotionality , emotional stress , psychology , electroencephalography , reserpine , hippocampus , novelty , methamphetamine , brain waves , neuroscience , audiology , physics , developmental psychology , medicine , psychiatry , social psychology
The hippocampal EEG power spectra of rabbits were analyzed to clarify the relationship between the theta-wave and emotionality. The relative power of T2 (6.0-7.9 Hz)/T1 (4.0-5.9 Hz) represented the index of theta-wave change. Emotional excitement (produced with novelty stress or methamphetamine) or suppression (produced with restraint stress or reserpine) increased or decreased T2/T1 ratios within around +/- 1 Hz changes. Furthermore, the imaging patterns of the peak feature make possible detailed characterization of emotional states. These results suggest that the hippocampus finely adjusts the theta-wave on a +/- 1 Hz level, with a fine balance of voltage, in response to the emotional activity.