The Mystery of Yawning in Physiology and Disease (Frontiers by O. Walusinski

By O. Walusinski

Yawning is a stereotyped phylogenetically historical phenomenon that happens in just about all vertebrates. As an emotional habit and an expressive circulation, yawning has many results; however, it has thus far been poorly addressed in clinical study and perform. Bringing jointly the newest examine from many fields, this quantity integrates present insights inside of embryology, ethology, neurophysiology, psychology, fMRI and pathology. The phylogenetic and ontogenetic points of yawning provide an enticing point of view on human improvement, and its incidence in neurological ailments - a space explored by way of just a couple of investigators - could provide necessary medical details. This publication will make necessary and interesting examining to neurologists, sleep experts, psychologists, ethologists and pharmacologists, in addition to to anyone attracted to uncovering the secret of yawning.

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Extra info for The Mystery of Yawning in Physiology and Disease (Frontiers of Neurology and Neuroscience, Vol. 28)

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Everyone yawns 5–10 times a day. Yawning is a recognized behavior in almost all vertebrates, from birds to humans; one which starts in the womb and continues until death. Although yawning often procures a sense of well-being for the yawner, attempting to mask this behavior is common practice worldwide. Modern neuroscience is still looking for a complete explanation of the intimate mechanisms of yawning. Moreover, its exact physiological purpose remains a subject of debate: some see yawning as a mechanism for stimulating wakefulness [1], while others contest this view and instead link yawing to sleepiness, but do not provide evidence for an arousing effect of yawning [2].

This harmonious sequence is markedly different than a brief swallowing episode. Using a color Doppler technique, it is possible to observe the flow of amniotic fluid through the fetal mouth, oropharynx, pharynx and trachea to the lungs [10]. This movement pattern is nonrepetitive in the fetus, contrarily to adults. Yawning appears to be clearly not just a matter of opening one’s mouth, but a generalized stretching of muscles, especially Fetal Yawning 33 those of the respiratory tract (diaphragm, intercostals), face and neck.

7 Le Camus A: La médecine pratique rendue plus simple, plus sûre et plus méthodique. , 1769, p 477. 8 Dunea G: On covering one’s mouth (when yawning). BMJ 2004;328:963. 9 Hippocrate: Open omnia. Anuce Foes. Frankfurt am Main, Wechel héritiers d’André 1595, p 379. htm. 10 Boerhaave H: Praelectiones academicae in proprias institutiones rei medicae. Gottingae, A. , 1741–1745, vol 4. 11 de Gorter J: De perspiratione insensibii. Patavii, J. Manfrè, 1755, p 328. 12 Charcot JM: Leçons du lardi à La Salpêtrière.

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