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An important characteristic of neuronal analogs of behavior in work which involves using stimulation of nerve tissue instead of stimuli originating in the external world, and which assesses an object's behavior according to the electrical reactions of neurons [i], is the degree to which they conform to the governing principles of the behavioral experiment, We therefore made it our aim, first, to select experimental conditions under which this conformity would be as full as possible, and, second, to study a broader spectrum of model properties than had hitherto been investigated, namely: the acquisition in one experiment of a neuronal analog of the conditioned response, differentiation, and extinction, the spontaneous recovery of the conditioned response after an interruption, a second acquisition, and limitation of the unconditioned response at the site of skipped reinforcement.Such a minute analysis is justified because, despite the obvious shortcomings of neuronal analogs of behavior, their use makes it possible to carry out subtle investigations which would be hard to achieve in studies of integral behavior.