Vol. 44 No. 4 (1984), Articles
Vol. 44 No. 4 (1984)

Circadian variation of yawning behavior

Articles
J Anías
Departamento de Investigationes Biomedicas, Instituto de Ciencias, Universidad Autonoma de Puebla, PUE, Mexico
B Holmgren
Departamento de Investigationes Biomedicas, Instituto de Ciencias, Universidad Autonoma de Puebla, PUE, Mexico
R Urbá Holmgren
Departamento de Investigationes Biomedicas, Instituto de Ciencias, Universidad Autonoma de Puebla, PUE, Mexico
J R Eguíbar
Departamento de Investigationes Biomedicas, Instituto de Ciencias, Universidad Autonoma de Puebla, PUE, Mexico

Abstract

Circadian variation of spontaneous yawning is demonstrated in a line of Sprague-Dawley rats, genetically selected for high frequency of this motor pattern. Yawning is highest in late light and early dark hours, both under natural and artificial illumination. The hypothetical neurotransmitters underlying this physiological rhythm in yawning are discussed.
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Copyright (c) 1984 Acta Neurobiologiae Experimentalis

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