Elicited ponto-geniculo-occipital waves by auditory stimuli are synchronized with hippocampal θ-waves

Akihiro Karashima, Kazuhiro Nakamura, Masahiro Horiuchi, Mitsuyuki Nakao, Norihiro Katayama, Mitsuaki Yamamoto

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


The study demonstrated that ponto-geniculo-occipital (PGO) waves are phase-locked with hippocampal θ-waves during rapid eye movement (REM) sleep. A possible mechanism for influencing a PGO wave generator by hippocampal θ-waves was hypothesized. The generator is known to receive afferent inputs such as auditory input. To test this hypothesis, the temporal relationship between hippocampal θ-waves and elicited PGO waves (PGOE) by auditory stimuli was analysed. The analysis showed that PGOE were synchronized with θ-waves, but did not reset the phase of a θ-wave. Because the occurrence of PGOE and spontaneous PGO waves shared the same phase-dependency on θ-waves, the results strongly suggest that the PGO wave generator was driven by θ-waves, as originally hypothesized.

Original languageEnglish
Pages (from-to)343-344
Number of pages2
JournalPsychiatry and Clinical Neurosciences
Issue number3
Publication statusPublished - 2002


  • Auditory stimulus
  • Elicited ponto-geniculo-occipital wave
  • Hippocampal θ-wave
  • Ponto-geniculo-occipital wave
  • Rapid eye movement sleep
  • Synchronization

ASJC Scopus subject areas

  • Neuroscience(all)
  • Neurology
  • Clinical Neurology
  • Psychiatry and Mental health


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