This experiment examined contextual interference in producing a bimanual coordination pattern of 90° relative phase. Acquisition, retention, and transfer performance were compared in a single-task control group and groups that performed 2 tasks in either a blocked or random presentation. Surprisingly, acquisition data revealed that both the random and control groups outperformed the blocked group. Retention data showed a typical CI effect for performance variability, with the random group outperforming the blocked group. Neither the random nor blocked groups outperformed the control group, suggesting interference of a second task may be as beneficial to learning as extra practice on the initial task. No group effects were found during transfer performance. Results suggest that random practice is beneficial for learning only one task.
D. Maslovat, R. Chua, and I.M. Franks are with the School of Human Kinetics at the University of British Columbia, Vancouver, BC Canada V6T 1Z1. T.D. Lee is with the Department of Kinesiology at McMaster University, Hamilton, ON Canada L8S 4L8.