Real or imagined incomplete lateralization of function in females?

Abstract

Visual field effects for 30 normal familial right-handed females were investigated with 4-point random forms known to be recognized more accurately in the right visual field by normal familial right-handed males, and the relationship between spatial ability and various performance patterns was examined. The forms were presented 2 deg in the left or right visual field. After a 10-sec delay, the subject decided whether or not a form exposed in central vision was the same as the stimulus. Incomplete lateralization of function appeared to be supported by the finding of no field differences. An alternative explanation was discussed since visual field superiority was significantly correlated with WAIS Block Design scores scaled for age, females with relatively low scores showing a right visual field superiority and females with relatively high scores showing a left visual field superiority. The experiment was repeated with 30 familial right-handed males. A significant right visual field superiority was obtained, but visual field superiorities were not correlated with measures of visuo-spatial or verbal ability. © 1976 Psychonomic Society, Inc.