This study compared subjects from right-handed families and nonright-handed families in their ability to solve a mental-rotation task when instructed to use one of two different spatial strategies. Results suggested familial nonright-handers may be stronger in transformation of mental images, but weaker in reorientation in relation to left-right…

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…

The Scholastic Aptitude Test scores of 86 left-handed undergraduates were examined as a function of familial sinistrality, strength of left-handedness, and sex. An interaction was found between familial sinistrality and strength of handedness in terms of aptitude. (Author/BS)

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…