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Preyer, who has studied this phenomenon in various animals, comes to the conclusion that it is usually due to unconsciousness as the result of fright. McCook is unable to accept this theory of kataplexy, so far as Spiders are concerned.
Sammlung physiologischer Abhandlungen, Zweite Reihe, Erster Heft, 1878. Romanes has an interesting discussion of the habit of feigning death among animals, and cautiously reaches the conclusion that it is very largely due, not to kataplexy, but to intelligent action. Mental Evolution in Animals, pp. 303-316.
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