Elements of Physiological Psychology a Treatise of the Activities And Nature O
Elements of Physiological Psychology a Treatise of the Activities And Nature O
George Trumbull Ladd
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For the muscle when electricity is used. The case is different, however, with the end-organs of sense. They do exhibit a certain sluggishness, and this is one reason why only so many sensations in a given unit of time can be produced by their successive irritation. The result of the inertia of the end-organs, as determining the number of separate excitations of which they are capable in a second, varifes for the different senses. The nerve-endings of touch probably exceed all others in the prom...ptness with which they re- spond to stimulus and then return to a relative equilibrium. But the number of separate sensations of this sense which can be pro- duced during a given interval depends in a remarkable way upon the quality and intensity of the stimulus, the place where it is ap- plied, etc. The results of different experimenters therefore differ widely. Preyer thought that 27. 6-36. 8 nervous shocks (per sec- ond) of the skin fused into one continuous sensation ; but Valentin put the limit at 480-640, and von Wittich ' succeeded in distinguish- 1 For his remarks on Prever's experiments, see the article in Pfluger's Archiv ii.
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