The Trail making Test, a commonly used enuropsychological screening measure, was administered to 143 subjects. The subjects who were included did not report any history of head injury, neurological insult, psychiatric problems, or substance abuse. Handedness was determined by a questionnaire and left-handed subjects whose hand position was inverted of "hooked" were paired with right-handed subjects matched for age, sex, race, and years of education. The study found that left-handed subjects performed significantly faster on Trails A and on Trails A+B. Suggested reasons for this include increased speed in visual scanning, greater visuo-motor speed or increased motivation to do well. The results also suggest that further research is needed to clarify these issues.
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