File:American journal of physiology (1898) (14779977374).jpg

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Identifier: americanjourn01ameruoft (find matches)
Title: American journal of physiology
Year: 1898 (1890s)
Authors: American Physiological Society (1887- ) American Physiological Society (1887- ). Abstracts of papers presented at the fall meeting American Physiological Society (1887- ). Proceedings
Subjects: Physiology Physiology
Publisher: (Bethesda, Md., etc.) American Physiological Society (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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. . 24.3 11.8 0.48 24.2 14.6 0.39 (jb) Constants obtained from different subjects.Right Hand. Subject.No. Max. A. 10 sec. A. Min. A. Mean A. 2 X .20 .60 .69 .42 3 X .17 .32 .56 .34 4 X .22 .33 .61 .42 5 X .29 .40 .80 .42 9 X .61 .70 .75 .70 rhythmical pressing with the other hand. The latter irregularity wasmore marked in these experiments than in the first ones. It ap-peared with the right hand pulling the dynamometer as in the otherseries. Probably sufficient practice would eliminate these. 3. I determined whether the constants in registering by two 294 Jeannette C. Welch. tubes would be less if the observations of the vibrations were madeby listening to the ticking of the pendulum rather than by visualobservation. TABLE V. Registration by pressi>tg two tiibis, .attditoj-y observation. Right H.a.nd. Left Hand. Ordinate. P. P- .^^^- P. P- ..=^. Mean Max. .10 sec. . .Min. . . . 27.524.220.2 20.417.014.4 0.260.290 28 25.423.520.5 17.114.411.4 0.350.380.44 Mean ^=0.28. Mean A - 0.38.
Text Appearing After Image:
Figure 6. Friction Machine. The constantsare less in audi-tory observationthan in visual,when the right hand only is used, butabout the same when the left handis used for the dynamometer. Themean ordinate is .28 with the righthand, and .38 with the left hand. Allof the constants of each hand showabout this same difference. Most ofthe constants obtained with the lefthand have shown less variation thanthose of the right hand, and haveaveraged less in all of the former ex-periments. Not being able to havesubjects for a sufficiently long timeto make these experiments with bothhands, I cannot say whether this dif-ference in the two hands is commonto most subjects, or simply peculiarto the one subject alone. The Measurement of Mental Activity. 295 4. I combined muscular eftbrt with the registration by substitut-ing a friction machine for the tambour. The friction machine(Fig. 6) consists of a wheel and axle to which is attached a jointedvertical rod carrying a long lever. At each revolution

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01
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30 July 2014

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