Abstract
Response thresholds to von Frey hair stimulation of intact and spinal frogs (Rana pipiens and Rana catesbeiana) were determined. While the response threshold of spinal frogs remained constant over test sessions, thresholds of intact frogs showed a progressive decline. This decline appears due to habituation to the testing procedure rather than to situational factors. Thus the intact frog, in contrast to the spinal preparation, is able to modulate segmental reflex activity. Implications of these behavioral findings for neuronal mechanisms are discussed.
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