Abstract
We studied the effects of different processing codes of an auditory secondary task on aided and unaided visual search performance using a 2 (aid: aided vs. unaided) x 2 (secondary task: present vs. absent) x 2 (processing code: verbal vs. spatial) mixed design. Participants were measured for workload, system trust, criterion settings, and sensitivity. Overall, the introduction of a secondary task (music, in this case) increased arousal and helped performance. Results also revealed higher levels of system trust when secondary task processing code was verbal. Furthermore, when comparing the effect of processing codes, the spatial secondary task led to higher levels of sensitivity than the verbal secondary task. The similarity of spatial processing codes between primary and secondary task evidently did not lead to interference in this context; on the contrary, the verbal secondary task processing code resulted in greater interference due to the inclusion of a text-based automated aid.
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