Abstract
In 3 runway experiments using intracranial stimulation (ICS) as a reinforcer, it was found that: (a) increasing the intertrial interval from 5 to 60 sec. decreased running speed, and decreasing the interval from 60 to 5 sec. increased running speed; (b) the effect of a change in interval was immediate; and (c) Ss [subjects] run in strict alternation in 2 runways with unequal ICS ran faster to the lower ICS even though, when allowed to choose, they preferred the higher ICS or showed no preference. Results sustain Deutsch''s (1960) contention that ICS has a rapidly decaying motivating effect that is independent of its reinforcing effect.

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