Image from page 49 of "Educational psychology" (1917)
Title: Educational psychology
Authors: Gordon, Kate
Subjects: Educational psychology
Publisher: New York : H. Holt and company
Contributing Library: University of California Libraries
Digitizing Sponsor: MSN
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the propernumber of hours of sleep for older children have beenassembled by Terman ^^^ as given in Table V. TABLE V Agb 6 7 8 9 10 11 12 13 14 15 16 17 18 Authority; Duke.... 131^ 13 12!^ 12 IIV^ 11 10^ 10 10 9^^ 9 9 8!^ Bernhard . ~ 11 11 11 10!^ lOU 10 10 9]^ Hertel . 11 10!^ 10!^ 10 10 9% ^14 9\4 9 9 8% .. .. Claparede im livi 111^ lOV^ 10!^ 9!^ 9^ OV^ 9 9 ManaceineU 11 11 11 10 10 9]^ 94 8^ 8V^ 8 8-7 .. Krollich 11 11 11 11 10!^ 10>^ 10 10 9)^ 9 9 8)^ 8]4 Btal. Andress ^ found, from records of a group of forty-nine students, that those whose average age was be-tween eighteen and nineteen years slept, on the aver-age, eight hcurs and fifty-three minutes, those 38 EDUCATIONAL PSYCHOLOGY between twenty and twenty-one years old slept, onthe average, eight hours and thirty-four minutes.There seem to be wide individual variations in theamount of sleep needed whether by adults or children.The quality or depth of sleep has been studied inthe following way: The experimenter, Kohlsehlit-
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0123 456 789 10 UHOURS Fig. 5. ter,^° dropped a ball from varying heights upon ametal plate, and in this way determined how louda sound was necessary to waken a sleeping subject.This was tried for the different hours of the subjectssleep period. Fig. 5 shows the height in centimeters(on the ordinate) which the ball had to fall in orderto waken the sleeper after a certain number of hours GROWTH OF BEHAVIOR. INSTINCT 39 of sleep (as shown on the abscissa). The generalform of this curve has been verified by other investi-gators for auditory, tactile, and electric stimuli. Itindicates that sleep attains its maximum depth at theend of an hour, or an hour and a half, and that itbecomes progressively lighter for the later hours. Animportant suggestion is made by Seashore ^^^ in viewof this fact. He writes: From this we may derivea principle of mental economy. Cut short the longlight sleep of the late morning hours and substitute ashort sleep at some favorable time during the workday. . . .
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