UNIGE document Scientific Article
previous document  unige:84754  next document
add to browser collection
Title

The functional relationship between yawning and vigilance

Authors
Mathis, Johannes
Herrmann, Uli S.
Hess, Christian W.
Published in Behavioural Brain Research. 2007, vol. 179, no. 1, p. 159-66
Abstract BACKGROUND: Although yawning is a ubiquitous and phylogenetically old phenomenon, its origin and purpose remain unclear. The study aimed at testing the widely held hypothesis that yawning is triggered by drowsiness and brings about a reversal or suspension of the process of falling asleep. METHODS: Subjects complaining of excessive sleepiness were spontaneously yawning while trying to stay awake in a quiet and darkened room. Changes in their electroencephalogram (EEG) and heart rate variability (HRV) associated with yawning were compared to changes associated with isolated voluntary body movements. Special care was taken to remove eye blink- and movement-artefacts from the recorded signals. RESULTS: Yawns were preceded and followed by a significantly greater delta activity in EEG than movements (p< or =0.008). After yawning, alpha rhythms were attenuated, decelerated, and shifted towards central brain regions (p< or =0.01), whereas after movements, they were attenuated and accelerated (p<0.02). A significant transient increase of HRV occurred after the onset of yawning and movements, which was followed by a significant slow decrease peaking 17s after onset (p<0.0001). No difference in HRV changes was found between yawns and movements. CONCLUSIONS: Yawning occurred during periods with increased drowsiness and sleep pressure, but was not followed by a measurable increase of the arousal level of the brain. It was neither triggered nor followed by a specific autonomic activation. Our results therefore confirm that yawns occur due to sleepiness, but do not provide evidence for an arousing effect of yawning.
Keywords AdolescentAdultArousal/physiologyElectroencephalographyFemaleHeart Rate/physiologyHumansMaleMiddle AgedSleep/physiologyStereotyped Behavior/physiologyWakefulness/physiologyYawning/physiologyYawningVigilanceArousalCommunicationBehaviourMaintenance of wakefulness test
Identifiers
PMID: 17337071
Full text
Article (Published version) (335 Kb) - document accessible for UNIGE members only Limited access to UNIGE
Structures
Research group Neuroréhabilitation assistée par imagerie (910)
Citation
(ISO format)
GUGGISBERG, Adrian et al. The functional relationship between yawning and vigilance. In: Behavioural Brain Research, 2007, vol. 179, n° 1, p. 159-66. https://archive-ouverte.unige.ch/unige:84754

85 hits

0 download

Update

Deposited on : 2016-06-27

Export document
Format :
Citation style :