Abstract
ABSTRACTThe morphology and scalp distribution of slow negative potentials elicited in type I conditioning, requiring no instruction, were studied. The paradigm involved the presentation of a conditioned stimulus (S1), followed 1500 msec later by an unconditioned stimulus (H), the electrical stimulation of the popliteal nerve evoking an ankle jerk (Hoffmann reflex).Our topographical data showed that two components develop in the interstimulus interval S1‐H: a large fronto‐central early component followed by a late centro‐parietal negative component which precedes the H‐reflex movement. This negative shift terminates abruptly in a positivity post‐H‐reflex.These anticipatory components show similarities, particularly at the parietal site, to slow waves elicited in a CNV paradigm involving the presentation of an indicative stimulus (S1) followed by an imperative stimulus (S2) requiring an operant motor response.These results are discussed in terms of conditioning, arousal, and early preparatory and time estimation processes.
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