A thermal window for yawning in humans: Yawning as a brain cooling mechanism

PHYSIOLOGY & BEHAVIOR

卷:130

Article

Massen, Jorg J. M.¹  Dusch, Kim²  Eldakar, Omar Tonsi³  Gallup, Andrew C.⁴ 

[1] Univ Vienna, Dept Cognit Biol, Vienna, Austria

[2] Univ Vienna, Dept Educ, Vienna, Austria

[3] Nova SE Univ, Farquhar Coll Arts & Sci, Ft Lauderdale, FL 33314 USA

[4] SUNY Coll Oneonta, Dept Psychol, Oneonta, NY USA

关键词: Yawning;    Contagious yawning;    Thermoregulation;    Ambient temperature;   

DOI  :  10.1016/j.physbeh.2014.03.032

来源: Elsevier

【 摘 要 】

The thermoregulatory theory of yawning posits that yawns function to cool the brain in part due to counter-current heat exchange with the deep inhalation of ambient air. Consequently, yawning should be constrained to an optimal thermal zone or range of temperature, i.e., a thermal window, in which we should expect a lower frequency at extreme temperatures. Previous research shows that yawn frequency diminishes as ambient temperatures rise and approach body temperature, but a lower bound to, the thermal window has not been demonstrated. To test this, a total of 120 pedestrians were sampled for susceptibly to self-reported yawn contagion during distinct temperature ranges and seasons (winter: 1.4 degrees C, n = 60; summer: 19.4 degrees C, n = 60). As predicted, the proportion of pedestrians reporting yawning was significantly lower during winter than in summer (183% vs. 41.7%), with temperature being the only significant predictor of these differences across seasons. The underlying mechanism for yawning in humans, both spontaneous and contagious, appears to be involved in brain thermoregulation. (C) 2014 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license

【 授权许可】

Free