AN INVESTIGATION OF DIFFERENCES BETWEEN 3 AGE-GROUPS IN VERBAL AND SPATIAL TASK-PERFORMANCE USING THE DUAL-TASK PARADIGM

A dual-task paradigm with concurrent verbal and spatial tasks was used to investigate differences across three age groups for lateralized effects, magnitude of tapping interference, and cognitive task output. In addition, rescaled scores comparing verbal with spatial measures within and across age groups were analyzed to examine asymmetric age differences for right versus left hemisphere abilities. Results of the present dual task finger tapping investigation of three age groups showed ail groups left lateralized for verbal tasks and right lateralized for spatial tasks. However, the magnitude of interference in tapping was significantly greater in paced nonideational shadowing tasks and during paced purposeful spatial tasks. Outcomes of exploratory analyses suggest a complex interplay between aptitude and the corresponding lateralized effects and cognitive effort to perform the task. (C) 1995 Academic Press, Inc.