The rate of learning measured at a single synapse.

Abstract
By a conditioning technique, learned extrinsic performance of muscle fiber groups innervated by single motor neurones was demonstrated in isolated spinal cords of mongrel dogs. Four successive alternations of conditioning and extinction produced avg. learned response curves which were progressively steeper. The velocities of these successive conditioning curves are plotted against the order of their occurrence. This method was devised to obtain a curve which represents the rate (acceleration) of a motor cell''s learning to initiate a learned response. The difference between the curve of learned motor performance and the curve of neural learning upon which the learned response depends is demonstrated. Individual motor cells are shown to possess independent ability to learn.

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