Rats were tested in an alley to determine the effect of reward sequence on the extinction and spontaneous recovery of latency and time. Daily, half of the Ss received a small reward on Trial 1 and a large reward on Trial 2 (SL), while the other half received the opposite sequence of rewards (LS). Resistance to extinction and spontaneous recovery were greater when a large reward fallowed a small reward than when a small reward followed a large reward. The results were discussed in terms of Capaldi's (1967) sequential learning hypothesis.
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