Lateral preference for identical geometric forms: I. Normals

Ss made size discriminations between two identical and equal-sized geometric forms presented tachistoscopically. Under “larger” instructions the right side stimulus was chosen more often. Under “smaller” instructions and 30 sec. intertrial interval, the left side was chosen more often; with 10 sec. intertrial interval and “smaller” instructions perceptual and motor preferences canceled one another.