. Handbook of mental examination methods. es. Touchhim on a part and have him locate the point touched, either bypointing to it with a finger or on parts which he cannot reachby describing the location. In locating with the finger do notpermit the patient to touch the part or there will result a confu-sion between the two stimuli. (d) Double Point Threshold.—If two points 2 cm. apart aresimultaneously applied to the skin, it is found that they are ap-preciated as two in certain regions and as one in others. Thevariations are as marked as those of the touch thresholds, and theparts which are mo
. Handbook of mental examination methods. es. Touchhim on a part and have him locate the point touched, either bypointing to it with a finger or on parts which he cannot reachby describing the location. In locating with the finger do notpermit the patient to touch the part or there will result a confu-sion between the two stimuli. (d) Double Point Threshold.—If two points 2 cm. apart aresimultaneously applied to the skin, it is found that they are ap-preciated as two in certain regions and as one in others. Thevariations are as marked as those of the touch thresholds, and theparts which are most sensitive to light touch are also most sensi-tive in the appreciation of the two points. Blunted compass points are commonly used for the stimula-tion of the areas, and a millimeter rule is necessary for determin-ing the distance between the points. Apparatus has been devised 30 MENTAL EXAMINATION METHODS to include both these, the most satisfactory for general use beingthat of Jastrow which is illustrated in Fig. 7. This instrument. i ? i ? i ? I .rl ? i i i .
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