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Dual-Task Redundant-Target Processing: The Case of the Limited Capacity Parallel Model

We examined the effect of a central tracking task on visual target processing efficiency in a combined target detection / manual tracking paradigm. Participants performed a redundant-target task by itself, and concurrently with the tracking task. A measure of workload capacity gauged target processing efficiency. Processing was less efficient than predicted by a standard parallel race model under both levels of task load. However, data suggested no difference in processing efficiency between the single-and dual-task conditions. Our findings provide further evidence that processing capacity for peripheral visual targets is consistently limited but robust against changes to concurrent task load.