55 subjects were divided by writing-hand preference and further divided into control and experimental conditions. All subjects were administered a manipulative skill at pretest, counterbalanced for starting hand. Experimental subjects were given 5 practice sessions, and then all subjects were administered a posttest. Posttest scores of both hands of experimental subjects indicated significant improvement as a result of practice, with the nonpreferred hand showing no significant difference from the preferred hand. These findings were related to the etiology of handedness which is hypothesized to involve two factors, one verbal and dichotomous, the other nonverbal and continuous.
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