The purpose of this study was to measure response organization effects in 30 children in Grade 4. On a reaction time task, subjects were pre-cued as to the forthcoming response, being either an ipsilateral or contralateral response, which hand to use, or on which side the response would be. In each condition, there were varying degrees of response uncertainty and predictability. Analysis indicated that knowing which hand to use played a major role in response organization. However, when the subject was unsure of which hand to use but the other variables were pre-cued, reaction time increased significantly.
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