Functional periodicity; an experimental study of the mental and motor abilities of women during menstruation . urves in terms of amount of work done,the time remaining constant; hence his curves showing improvement runupward, while the practice curves of the present study run downwardbecause they are platted in terms of the time of performance, the amountof work remaining constant (except in the steadiness test, and here thepractice curve also runs downward because the effort was to do as littleas possible, that is, to make as few touches as possible, instead of asmuch as possible). 78 Functio
Functional periodicity; an experimental study of the mental and motor abilities of women during menstruation . urves in terms of amount of work done,the time remaining constant; hence his curves showing improvement runupward, while the practice curves of the present study run downwardbecause they are platted in terms of the time of performance, the amountof work remaining constant (except in the steadiness test, and here thepractice curve also runs downward because the effort was to do as littleas possible, that is, to make as few touches as possible, instead of asmuch as possible). 78 Functional Periodicity The curves from Wellss study are reproduced in Figures 13,14, 15 and 16. Wells took no note whatever of the occurrenceof menstruation in the five women subjects, so we do not knowwhere on their curves these periods fell; and it is impossibleto tell by inspection in any case which were the days presumablyaffected. The curves of the women show no characteristic lapsesfrom efficiency, but are quite indistinguishable in course and formfrom those of the men, as in the case of the present Qiy llitf^lt f !• II IX 11 IV If It n It It ii ju xt li Figure 4.—Samples of Stephensons Curves, after Jacobi. Reproduced from Amer. Jour. Obstet., 1882, Vol. 15. Cm>^«y4 ^ Temperature (average ). Curve B = Pulse. Curve C = Urea (average grms.). These are the average curves of three total cycles of twenty-threedays each. The records indicate the daily deviations above and belowthe average. Curves of Physiological Processes 79 Tafpir,^
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