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This Concept Map, created with IHMC CmapTools, has information related to: Lemmerman Patel Communication, after waking as seen in figure 4., sensation of being mid-yawn, example of "fixed action pattern", studied by Signe Preuschoft, rapid in response to single stimulus, clenched-teeth yawn occurs when teeth, smiling can communicate a variety, teeth are clenched, classical animal behavior or ethology, studied by Charles Darwin, yawning is NOT short duration, 3 different ways such as closed-nose yawn, a reflex in response to single stimulus, yawning is an example, yawning is NOT proportional response, closed-nose yawn occurs when nose is pinched, yawning is contagious, Charles Darwin who said it was first step, stretching after waking, in various forms such as smiling