MICROANATOMY

Detailed explanation-1: -Another theory for why we yawn is the thermoregulatory hypothesis. This suggests that yawning cools the brain. Yawning causes a deep inhalation that draws cool air into the mouth, which then cools the blood going to the brain.

Detailed explanation-2: -What is known is that the behavior is contagious. The likelihood of yawning increases sixfold, according to one study, after seeing someone else yawn. As for yawn contagion, Giordano said it may be related to a phenomenon called social mirroring, where organisms imitate the actions of others.

Detailed explanation-3: -Excessive yawning reasons include: Physical Causes-Fatigue, general tiredness, body temperature malfunctions, and stimulation of the vagus nerve can cause frequent yawning. Excessive yawning and sleep disorders are often correlated. Emotional Causes-Anxiety and depression can lead to yawning excessively.

Detailed explanation-4: -Taken together, experts believe that contagious yawning may be a social communication tool specific to higher-order animals. In the context of the brain-cooling theory of yawning, perhaps yawning evolved to become contagious as a means to increase the cognitive performance and vigilance of people within a group.