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[Yawning is an arousal reflex thought to be generated in the brainstem reticular formation to counteract brain hypoxia; it may precede vasovagal syncope. Excessive or pathological yawning (chasm) is compulsive, repetitive yawning not triggered by physiological stimuli such as fatigue or boredom.]
Published: Oct 15, 2010
Keywords: Amyotrophic Lateral Sclerosis; Progressive Supranuclear Palsy; Motor Neurone; Vasovagal Syncope; Cross Reference
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