. Handbook of mental examination methods. duals; the abnormal, and especially the insane, show cer-tain variations from these which have been taken by some investi-gators to be distinctive characteristics in particular diseases. If 48 MENTAL EXAMINATION METHODS the rubber bulb and tambour be used there will also be noted avariation in the force of the individual movements during thecourse of a 30-second series of taps. (d) Speed of a Single Movement.—If a kymograph be avail-able the speed of the single movement may be estimated. As faras is known, this has no diagnostic value, although we have
. Handbook of mental examination methods. duals; the abnormal, and especially the insane, show cer-tain variations from these which have been taken by some investi-gators to be distinctive characteristics in particular diseases. If 48 MENTAL EXAMINATION METHODS the rubber bulb and tambour be used there will also be noted avariation in the force of the individual movements during thecourse of a 30-second series of taps. (d) Speed of a Single Movement.—If a kymograph be avail-able the speed of the single movement may be estimated. As faras is known, this has no diagnostic value, although we have notsufficient data at hand to say definitely that the speed of theindividual movements does not vary in accordance with definitedisturbances of the nervous system. For determining the speedof the individual movement the kymograph should be horizontal,revolving at its greatest rate and so arranged that the subjectcan write upon the kymograph directly with a pencil or arrangement for these simple experiments is illustrated in. Fig. 12. Arrangement for test of speed of single movement. K, kymo-graph; A, hand and arm rest. the accompanying figure (Fig. 12). K is the kymograph drum,and A is a large stand which partly fits over the drum and onwhich the hand and arm of the subject rest when the movementis performed. The end of the stand approaches rather closelythe smoked paper. The subject should be instructed to hold thepencil or stylus at one end of the platform and to make repeatedmovements of a definite extent, the amount of movements inthis case being limited by the length of the drum. (e) Qualitative Determination of the Speed of Single Move-ments.—A simple method of determining the speed of single MOVEMENT 49 movements is as follows: Present to the subject a pencil and asheet of paper; instruct him to begin at one end of the sheet andin a series of forward and backward movements to draw linesas quickly as possible rather closely together and to continue theback
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