Abstract
The identity model which was tested states that response probability increases with reinforcement and remains unchanged with nonreinforcement. Three groups of rats, having the same total number of trials on which water reinforcement could occur, differed in the total number of trials on which nonreinforcement could occur. While significant changes within each group occurred from the 1st to the last 20% of trials, there were no significant differences among the groups on the 1st 20%, last 20%, or over all trials. Stat-rat data were generated and showed good agreement with empirical data. It was concluded that nonreinforced trials acted as "blank" trials.

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