This study examined the effect of asymmetrical posture on I normal subjects' performance on a line bisection task, as measured , by accuracy and response time. There were 50 male and 50 female subjects with a mean age of 35 (SD=12) years. Right and left handed subjects were tested. The subjects completed the line bisection tasks in three randomly ordered positions, 30 degree lateral lean to the left and right, and midline. The subjects' response times were recorded as well as the distance of their response from true center. The results of this study indicated that lateral lean significantly increased response time (P=.0003). Although there was no statistically significant difference between task positions for accuracy, it was interesting to note that the means of all task positions were to the left of true center. Subjects were generally most accurate in the upright position. One application of this study's results is the importance of monitoring the neurologic patient's posture during testing. It is especially important when timing their response is a component of testing.
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