The effect of divided attention on probe reaction time in multiple-task performance.

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Abstract
Information processing demands were examined in 5 experiments in which subjects performed a serial addition, pursuit tracking or probe reaction time task separately as well as in dual- and triple-task combinations. The experiments manipulated the assigned priority and the capacity requirements of the serial addition and tracking tasks. Probe reaction time usually reflected spare processing capacity in dual-task studies and increased with greater processing demands. Since probe reaction time did not increase between dual- and triple-task conditions. It probably measured spare capacity which remained relatively constant as processing demands increased.

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