In 4 experiments, adult Ss learned bigrams under either immediate or delayed reinforcement and in a discrimination or a paired-associate task form. All Ss relearned the same material 7 days later. In addition, 2 of the experiments investigated the effects of 3 levels of monetary reward on acquisition and retention. The results indicated that delayed reinforcement improved retention of paired associates, but had no effect on acquisition or retention in the discrimination task. Effects of monetary reward were uniformly nonsignificant. (PsycINFO Database Record (c) 2006 APA, all rights reserved)