The learning of generalized motor programs: Reducing the relative frequency of knowledge of results enhances memory.

Wulf, G., & Schmidt, R. A. (1989). The learning of generalized motor programs: Reducing the relative frequency of knowledge of results enhances memory. Journal of Experimental Psychology: Learning, Memory, and Cognition, 15(4), 748–757. https://doi.org/10.1037//0278-7393.15.4.748