Memoirs of the National Academy of Sciences . ereuce in the time of the reaction might be due to differences in the cerebral reflexrather than to the distance traveled by the imjiulse. We tried to elinunate these complicationsby adjusting the intensity and area and by choosing points on the skin where the sensationswere alike, and shall subjoin the results of our experiments. It was, however, this difticultywhich led us to substitute a touch or l)low for an electric shock, and we believe our experimentson touch are the more satisfactory, as we couid measure the force of the blow, whereas we co
Memoirs of the National Academy of Sciences . ereuce in the time of the reaction might be due to differences in the cerebral reflexrather than to the distance traveled by the imjiulse. We tried to elinunate these complicationsby adjusting the intensity and area and by choosing points on the skin where the sensationswere alike, and shall subjoin the results of our experiments. It was, however, this difticultywhich led us to substitute a touch or l)low for an electric shock, and we believe our experimentson touch are the more satisfactory, as we couid measure the force of the blow, whereas we couldnot measure the physiological effect of an electric shock. In our first experiments we chose four points on the skin for the application of the were permanently fixed by pricking the skin and introducing nitrate of silver. Two of thepoints were on the arm over the median nerve and two on the leg over the posterior tibial points on the arm 7> aiul D are shown in the lut: they were 30 cm. apart, and the length of. ilG. li. the intervening nerve would be nearly the same. The corresponding points on the leg .1/ and ^Vwere .)<» cm. ai)art. The same objective current did not call up the same sensation on the severalIjoints. The shock was more massive and stronger at the upper points, and was followed bycontractions of the muscles. It was rather stronger on the arm than on the leg. Five hundredreactions with the hand to stimulation of each of these points and five hundred reactions with We are not in this place especially concerned with the muscular contraction directly following on electricalgtiiuiilation of the skin. Motor points have been mapped out on the skin, the stimulation of which is followedby thf contraction oj special muscles. These are considered in work on the appliciitinn of electricity to have made some observations on this matter, especially on the eftects of successive stimuli, but they are not •sufficiently systematic
Size: 3086px × 810px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidmemoirsofnat, bookyear1895
