Abstract
The effects of N-R transitions (nonrewarded trials followed by a rewarded trial) on rats' and pigeons' extinction performance were investigated in two experiments using an operant analogue to discrete-trial procedures. Pigeons that received N-R transitions during the acquisition of a discrete-trial key-pecking response were significantly more resistant to extinction than two control groups that had been trained with either R-N transistions or continuous reinforcement. The same comparisons resulted in a similar but less dramatic effect when rats' lever pressing was studied. The results indicate that E. J. Capaldi's 1967 sequential theory is not procedure-bound and that it could be a useful tool in bridging the gap between the research using discrete-trial runway procedures and that using operant procedures.
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