Resolution of Dual-task Interference in Persons with Right- or Left-Hemispheric Dominant Brains

This study investigated the effects of concurrent cognitive tasks on right or lefthemispheric dominant brains. Lateral Preference Inventory was administered on 787 girlstudents and, using purposive sampling method, 60 were selected as participants. Aftercontrolling participants’ handedness and intelligence, they were divided into two groups of30 with right or left hemispheric dominant brains, and were tested against dual cognitive task interference. The independent t-test confirmed significant differences between the right and left hemispheric dominant brains’ reaction times, when and only when SOA was 50ms. These findings supported the bottleneck theory of resolution of dual-task interference, and the difference between behavioral performance of right-and left-hemispheric dominant brains. They also suggested substantial impact of hemispheric dominance on cognitive functions, such as resolution of dual-task interference, instead of only control of handedness.