Effect of experience on recovery following CNS lesions

Is More Always Better? Optimal Amounts of Feedback in Learning to Calibrate Sensory Awareness

Contrary to predictions from early views on motor learning, recent studies have shown that reduction of the relative frequency of feedback regarding the success in achieving a goal (knowledge of results = KR) depresses performance during acquisition; whereas, in retention and transfer tests, an inverse relationship is found between performance and KR. The present study investigated the effect of reduced relative frequency of KR on the ability to calibrate kinesthetic awareness of 90 healthy young and older subjects. Across three task versions of kinesthetic acuity, practice conditions of 100% KR were compared with 33% equally spread and 33% faded practice conditions. The results of this study show that reduced relative KR frequency depressed the performance of the older subjects but raised the performance of the younger subjects in the acquisition phase. In retention, reduced relative KR frequency produced more effective performance than 100% KR, with no difference between the two age groups or the two 33% KR frequency conditions. These results seem to imply that treatment of patients on the ability to calibrate sensory awareness is benefited by providing these patients with KR at a low frequency.