Effect of sleepiness on frequency characteristics of auditory response

Akihiro Karashima, Hiromi Mukoda, Norihiro Katayama, Mitsuyuki Nakao

Research output: Contribution to journalArticlepeer-review


The relationship between sleepiness and amplitude of amplitude-modulation following response (AMFR) was investigated to find the best tone to raise awareness of drowsy driver. In this study, AMFRs evoked by amplitude modulated (AM) tones whose carrier frequencies were 500, 1000, 4000, and 8000 Hz were recorded in 17 subjects. Sleepiness level was divided into three stages (Wake stage, Drowsy stage, and Sleep stage) by using reaction time of psychomotor vigilance task. We found that powers of AMFR evoked by 1000, 4000 and 8000 Hz AM tone were decreased as the increment of their sleepiness, but power of the response evoked by 500 Hz AM tone did not decrease in Drowsiness stage. These results suggest that the low frequency tone could make drivers recognize their own sleepiness and help to reduce the risk of drowsy driving.

Original languageEnglish
Pages (from-to)O-369-O-370
JournalTransactions of Japanese Society for Medical and Biological Engineering
Publication statusPublished - 2014 Aug 17


  • Amplitude-modulation tone
  • Evoked response
  • Sleepiness

ASJC Scopus subject areas

  • Biomedical Engineering


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