Ultrasonic vocalisations during rapid eye movement sleep in the rat.

Publisher: Published on behalf of the European Sleep Research Society by Blackwell Scientific Publications Country of Publication: England NLM ID: 9214441 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1365-2869 (Electronic) Linking ISSN: 09621105 NLM ISO Abbreviation: J Sleep Res Subsets: MEDLINE

Original Publication: Oxford ; Boston : Published on behalf of the European Sleep Research Society by Blackwell Scientific Publications, c1992-

Sleep, REM*/physiology ; Vocalization, Animal*/physiology ; Sleep Deprivation*/physiopathology; Animals ; Rats ; Male ; Obesity/physiopathology ; Rats, Wistar ; Ultrasonic Waves ; Ultrasonics

Rats are known to use a 22-kHz ultrasonic vocalisation as a distress call to warn of danger to other members of their group. We monitored 22-kHz ultrasonic vocalisation emissions in rats (lean and obese) as part of a sleep deprivation study to detect the eventual presence of stress during the procedure. Unexpectedly, we detected ultrasonic vocalisation emission during rapid eye movement (REM) sleep, but not during non-REM (NREM) sleep, in all the rats. The event occurs during the expiratory phase and can take place singularly or as a train. No difference was detected in the number or duration of these events in lean versus obese rats, during the light versus the dark period, and after sleep deprivation. As far as we know, this is the first report showing that rats can vocalise during REM sleep.
(© 2023 The Authors. Journal of Sleep Research published by John Wiley & Sons Ltd on behalf of European Sleep Research Society.)

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Keywords: diaphragm EMG; high‐fat diet; sleep deprivation

Date Created: 20230711 Date Completed: 20240514 Latest Revision: 20240514

20240514

10.1111/jsr.13993

37430421