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Dresslar observed a thirteen months' old baby for four hours, and found, to follow Preyer's classification, impulsive or spontaneous, reflex, instinctive, imitative, inhibitive, expressive, and even deliberative movements, with marked satisfaction in rhythm, attempts to do almost anything which appealed to him, and almost inexhaustible efferent resources.
In the third year, the night sleep lasted regularly from eleven to twelve hours, and sleep in the daytime was no longer required. Preyer's record stops here.
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