Spinal Conditioning in Dogs

Abstract
An electric shock (conditioned stimulus) to the left rear foot of chronic spinal dogs was paired with an unconditioned shock stimulus to the right rear foot. The response to be conditioned was flexion of the entire right hind limb. 1000 trials were given in groups of 100 trials each, on alternate days for about 3 wks. Twitching of the right rear leg was evoked by the conditioned stimulus to the left foot, but in the right hind limb extension often occurred instead of incipient flexion. The 2 movements were antagonistic and mutually inhibitory. The spinal behavior could not be fitted into the conditioning formula.

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