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1.
S₁: Yawning or its absence has been related to various clinical conditions.
S₆: It is in reality a releasing stimulus.

P: Interestingly, some clinicians claim that those with acute physical illness don't yawn until they are on the road to recovery.
Q: It can be a symptom of brain lesions, haemorrhage, motion sickness and encephalitis.
R: But what is currently known about yawning is essentially anecdotal, mostly because the yawn has not got the respect it deserves.
S: On the other hand, it has been reported that psychotics rarely yawn, except those suffering from brain damage.