Peripheral Coding Mechanisms of Touch Velocity
In November 1925 Adrian and Zotterman managed for the first time to record electrical impulses set up in a single fiber originating in a mechanoreceptive end-organ and thereby provide direct evidence for the basic principle that the conduction in sensory nerves is an all-or-none event. They found, furthermore, in a subsequent study that the mechanoreceptors could be dichotomized into rapidly and slowly adapting categories on the basis of the adaptive properties (Adrian and Zotterman, 1926).
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