. The Journal of comparative neurology and psychology. ad of cotton wool or thelight brush, we use an instrument that will enable us to give differentdegrees of stimulation, we find the area insensitive to cotton wooldoes not give a sensation on stimulation, even with considerableamounts of stimulation. N^eiffliborinc: areas in which there can be Ii8 Journal of Comparative Neurology and Psychology. no doubt of the presence of both cpicritic and protopathic sensi-bilities do not show a normal amount of sensibility to this formof stimulation. There is a gradual decrease in the loss or in thedull
. The Journal of comparative neurology and psychology. ad of cotton wool or thelight brush, we use an instrument that will enable us to give differentdegrees of stimulation, we find the area insensitive to cotton wooldoes not give a sensation on stimulation, even with considerableamounts of stimulation. N^eiffliborinc: areas in which there can be Ii8 Journal of Comparative Neurology and Psychology. no doubt of the presence of both cpicritic and protopathic sensi-bilities do not show a normal amount of sensibility to this formof stimulation. There is a gradual decrease in the loss or in thedullness of sensibility from the area of cpicritic loss, Ave may savfrom area of complete sensibility loss, to the area in which no sensorychange, according to Heads methods, can be demonstrated. Theaccompanying figure illustrates the conditions found on the hand. The area tested was carefully examined for hairs, and whereverhairs were found, the ])art was carefully shaved. The part of thearea insensitive to cotton wool was mapped out and recorded on the. Fig. 5.—To illustrate the sensibility of the hand determined by Blochsinstrument, compared with the loss of pressure and light touch sensations. hand with red ink. The sensibility to pressure and to forms ofstimuli denoting the presence or absence of protopathic sensibilityAvas also tested and the areas of loss were marked on the were then selected separate from each other by 1 cm. Thesewere also marked with red ink so that the stimuli could be eivenat approximately the same spots each time. These points werethen examined with the help of Blochs instrument illustrated experiments were made on each point and on correspondingpoints on the right hand. Table I gives the results of this form ofexamination. The letters indicate the corresponding areas on theleft (nerve cut) and right hands. The figures give the averages of Franz, Sensations folloiumg Nerve Division. 119 five determinations of the just perceptibl
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