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Evolutionary psychologist Andrew Gallup and his colleagues investigated the hypothesis that yawning plays a crucial role in brain cooling. Their research, involving observing numerous yawning instances across various species and analyzing brain weight and neuron counts, suggests a strong correlation between yawn duration and these neurological factors. The study posits that deep inhalation during a yawn cools the brain, while jaw stretching increases blood flow, both contributing to thermoregulation. The increased frequency of yawning at night, when body and brain temperatures are at their peak, further supports this theory. 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