Performance of Concurrent Tasks: A Psychophysiological Analysis of the Reciprocity of Information-Processing Resources

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Abstract
The resources allocated to a primary and secondary task are reciprocal. Subjects performed a tracking task in which the discrete displacements of the tracking cursor could be used to elicit event-related brain potentials. As the resource demands of the tracking task were increased, potentials elicited by the task-defined events increased in amplitude, whereas those elicited by secondary task auditory stimuli decreased.

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