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KMID : 0380319920500000113
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Journal of Korean Research Institute for Better Living
1992 Volume.50 No. 0 p.113 ~ p.123
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The KR Delay Interval Effect on Motor Learning as a Function of Task Characteristics
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Abstract
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In two experiments, the effect of KR delay interval was experimentally investigated as a function of task characteristics. In both Exp. Ⅰ(fast discrete coincidence timing task) and Exp. Ⅱ(slow continuous pursuit rotor task), three groups of subjects were given KRs either 2 seconds, 10 seconds or 20 seconds after each practice trial for ten blocks of trials, followed ten minutes later by two five trials of transfer tests with two different transfer tasks. Analysis of absolute timing error(Exp. Ⅰ) and time on target(Exp. Ⅱ) as a function of practice phases(acquistion phase ; transfer phase) disclosed that : performance scores improved with the length of KR delay interval, i.e., the performance in practice and transfer was best when the KR delay interval was long(20 sec) and poorest in the short KR delay interval condition. The KR delay interval effect was not statisticallly significant in Exp. Ⅰ, but significant in Exp. Ⅱ, while the block effects(Exp. Ⅰ and Exp. Ⅱ) along with delay interval×block interaction effect(Exp. Ⅱ) was also significant. These results indicated that the KR delay interval is significant performance and learning variables for slow continuous movements while it is not for fast discrete movements. Also, the KR deday interval effect grew larger as the practice trials continued to proceed. Taken altogether, the results was interpreted to negate a common intuitive belief that an immediate KR is more effective for motor learning than a delayed one, while suggesting that for better performance it is necessary and more effective to allow some duration of time to the learners before giving KRs so that the learners have enough time to process and evaluate self-perceived information(intrinsic feedback) and plan, on that basis, the next trials in comparison with KRs given.
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