Criticism of the theory that massed practice depresses performance as well as learning asserts that any generalization based on some limited amount of admissible evidence will provide an incomplete description of the psychological processes underlying skill learning. (JD)

Use of a retention test in an investigation regarding the post-knowledge of results (KR) interval provides evidence suggesting that, while activity during the post-KR interval is detrimental to performance, no such assumption can be made about its effect on learning. Implications for motor learning and performance are discussed. (Author/PP)