Beta-1 (10-20 Hz) cortical oscillations observed in the human medial temporal lobe

Nobuhide Hirai, Sunao Uchida*, Taketoshi Maehara, Yoshiro Okubo, Hiroyuki Shimizu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


During wakefulness, signals from subdural electrodes attached to the basal and medial temporal lobes of adult human epilepsy patients revealed a rhythmic oscillation in the beta-1 frequency range (10-20 Hz). This activity was more prominent in the medial than in the basal temporal cortex. We also observed simultaneous oscillations in alpha frequency activity in the medial and the basal temporal cortices. In an eyes-open condition, the alpha oscillation was attenuated, while the beta-1 oscillation in the medial temporal lobe was not. This is the first report that the beta-1 oscillation is present in the human medial temporal lobe. Since we recorded this activity from within the limbic system, beta-1 activity may be an analog of the hippocampal rhythmic slow activity observed in some animals.

Original languageEnglish
Pages (from-to)3055-3059
Number of pages5
Issue number14
Publication statusPublished - 1999 Sept 29
Externally publishedYes


  • Beta-1 oscillation
  • Human medial temporal lobe
  • Limbic system
  • Parahippocampal gyrus

ASJC Scopus subject areas

  • Neuroscience(all)


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