Cerebral dominance assessed by object- and color-naming latencies: Sex and familial sinistrality effects

Two vocal RT experiments were conducted. The first required the naming of five lateralized drawings of common objects; the second of five hues of equal brightness and saturation. Tachistoscopic exposure time was 100 msec. Both tasks yielded faster RT to stimuli channeled directly to the left hemisphere, demonstrating that the left hemisphere superiority for naming letters or digits obtained in previous tachistoscopic studies was not dependent on the use of alphanumeric stimuli. Interesting sex differences in object-naming and familial sinistrality differences in color-naming were obtained. Compared with other behavioral tasks for assessing language laterality, color-naming seems highly recommended in terms of freedom from spatial-confounding, good percentage agreement with clinical estimates of the frequency of left hemisphere language dominance in right handers, and sensitivity to familial sinistrality influences.