The relationships among preferred handedness, family history of sinistrality, sex of subject, and spatial visualization were examined in college students. Males outperformed females at all levels of handedness when measured as a continuous variable. Extreme handedness was associated with poorest performance. Decreased hemispheric specialization…

Left-handers with an inverted handwriting posture were compared with other left-handers and with right-handers on a spatial reasoning test. Results were consistent with the hypothesis that left-inverted subjects had relatively bilateral representation of verbal and spatial functions. Bilateral representation is assumed to be inefficient.…

Relationships between brain-lesion location and behavior in 33 males and 31 females with unilateral lesions were studied. Statistical tests suggest that a single model can describe the relationships for females, but in males separate models of the relationships between lesion location, verbal intelligence quotient, and performance intelligence…