Js. Caroselli et al., WEBSTER SCATTERGRAM METHOD - USEFULNESS FOR ASSESSING THE ASYMMETRY OF INTERFERENCE BETWEEN CONCURRENT TASKS, Neuropsychology, development, and cognition. Section A, Journal of clinical and experimental neuropsychology, 19(2), 1997, pp. 185-190
Webster (1988) described a means of using scattergrams to represent th
e manual and nonmanual data from dual-task laterality experiments in a
composite analysis. We used Webster's method and the conventional app
roach (i.e., separate analyses) to analyze the results of an experimen
t in which 40 right-handed adults performed a verbal and a manual task
concurrently. Whereas separate analyses yielded dissimilar outcomes f
or the two tasks, the scattergram analysis showed that overall interfe
rence was greater when the right hand performed the manual task than w
hen the left hand performed the manual task. Advantages of the scatter
gram method for analyzing dual-task data are discussed.