Lateral preference for identical geometric forms: II. Retardates

Adolescent educable retardates made size discriminations between pairs of equal-sized geometric forms presented tachistoscopically (Experiment I) or manually with unlimited exposure (Experiment II). There was no side preference under tachistoscopic presentation. Under unlimited exposure Ss showed a strong preference to choose the right-side stimulus as the larger (59.1%). Normals, from previous studies, had a preference to perceive the right-hand stimulus as larger under both conditions.