Abstract
The effects of additional practice trials on the Displacing Test and Turning Test of the Minnesota Rate of Manipulation Tests were studied to determine whether the use of normative data from sighted persons in evaluating the motor skills of blind individuals was valid. Blind vocational rehabilitation clients (N=100) were given the MRMT after three practice trials. Contrary to what is commonly believed, they essentially scored lower than people with normal vision, their means on both tests being at the first percentile of the norms for sighted persons. “Low” or “Very Low” range scores (31st percentile or below) were obtained by 83 percent and 68 percent of the blind clients on the Displacing Test and Turning Test, respectively. Accordingly, the use of this procedure can unfairly penalize blind persons.
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