Dual-task repetition alters event-related brain potentials and task performance

ObjectiveWe examined the modulation of event-related brain potentials (ERPs) and the accuracy of sensori-motor coordination on short-term repetition of the concurrent performance of a somatosensory discrimination (oddball) task and a visuo-motor tracking task.MethodsThe subjects concurrently performed visuomotor tracking and somatosensory oddball tasks. In the dual-task condition, the subjects performed the visuomotor tracking and somatosensory oddball tasks concurrently for about an hour. In the oddball-only condition, they performed just the oddball task for the same period.ResultsTracking performance improved with task repetition. The amplitude of the P300 elicited by somatosensory stimulation in the oddball-only condition decreased significantly with task repetition, whereas in the dual-task condition, it showed a complex pattern of change. The earlier responses were decreased in amplitude in the dual-task condition compared to the oddball-only condition, and gradually decreased with task repetition in both conditions.ConclusionsDynamic changes in ERPs and task performance with dual-task repetition support the idea that dual-task repetition produces changes in resource allocation following the automation of stimulus processing in addition to so-called habituation.SignificanceThis study also provides evidence for use of ERP amplitudes as physiological indices of functionally different types of resources.

► The amplitude of the P300 showed a complex pattern of change with dual-task repetition, which is different in the time course from so-called habituation. ► This may be associated with resource allocation in addition to so-called habituation. ► The different patterns among P100, N140, P300 and behavioral performance support the previous suggestion that they are associated with functionally different types of resources.