Free-Hand Copying of a Geometric Pattern as a Test for Sensory-Motor Disturbance

Abstract
Detailed measurements of freehand copies of a geometric figure were made in order to assess the utility of such drawings for reflecting changes in skilled manual performance. For normal Ss, reliability was satisfactory only for short time-intervals and for certain parameters. However, measures of size of drawings and the placement of spiral lines appeared to show differential sensitivity to stimulant, tranquilizer, and stress conditions.