Abstract
Abstract Habituation and sensitization of the flexor withdrawal reflex (tibialis anterior muscle) were studied in acute spinal cat as a function of stimulus intensity and frequency for frequencies ranging above 1 2 sec. The following relationships were consistently observed: (1) habituation is an exponential decline in response amplitude which occurs as a function of iterated stimulation of cutaneous afferents. In some instances habituation may be described as linear over much of its course; (2) habituation occurs more rapidly and to a greater degree of response decrement for higher frequencies of stimulation; (3) habituation is more pronounced for low intensities of stimulation than for high intensities, and; (4) sensitization occurs as a response increment with repetitive stimulation of cutaneous afferents under certain circumstances and may show two distinct time courses, short-term and long-term sensitization. These two phenomena may be differentiated on the basis of stimulus intensity, frequency and their interaction.
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