. The Journal of comparative neurology and psychology. e of thefourth and ring fingers, the first two joints of the second and indexfingers and about half of the thumb. For comparison, the area in-sensitive to pressure with a pencil is illustrated on the same diagram 232 Journal of Comparative Neurology and Psychology. by the use of vertical lines. In only a small portion of the thirdfinger does the area of insensitivity to pressure go beyond that ofinsensitivity to cold. Fig. 7 gives in a similar way the area insens-itive to hot stimuli. For compatison, with the areal loss of coldand hot sens
. The Journal of comparative neurology and psychology. e of thefourth and ring fingers, the first two joints of the second and indexfingers and about half of the thumb. For comparison, the area in-sensitive to pressure with a pencil is illustrated on the same diagram 232 Journal of Comparative Neurology and Psychology. by the use of vertical lines. In only a small portion of the thirdfinger does the area of insensitivity to pressure go beyond that ofinsensitivity to cold. Fig. 7 gives in a similar way the area insens-itive to hot stimuli. For compatison, with the areal loss of coldand hot sensations, the area insensitive to light touch is drawn. Onthe back of the hand and on the index finger the area of insensibilityto light touch is greater than that to heat, while on the thumb thearea for hot sensation loss is greater than for light touch. Withthe exception of a very slight portion of the thumb the area in-sensitive to cold is included within that insensitive to light a general way, therefore, these results, as has already been. Fig. 7.—Area insensitive to liot stimuli, compared witli loss of sensationsto light touch. Area insensitive to hot stimuli inclosed within heavy marl<ed with horizontal lines insensitive to light touches (cotton wooland camel hair brush). said, confirm the obsen^ations of Head. The facts that do not agreewith those of Head are: There are different extents of areas respond-ing to different degrees of temperature; the area for the appreciationof hot stimuli, for example, not being the same as that for the ap-preciation of cold stimuli as such; temperatures of extreme degreeare felt like medium temperatures or call forth sensations of warm-ness or coolness on areas which do not respond to the medium tem-peratures with a corresponding sensation of warmth or coolness. The results obtained from the arm may be taken to mean thatwhenever a cold or hot stimulus was given there was a radiation ofeffect from the stimul
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