Abstract
This study examined the effects of several properties of a simulated in-vehicle-task (IVT) on interference with a concurrent tracking task, which simulated vehicle control. We compared auditory, visual and redundant delivery of IVT information, under conditions when the visual display was close and separated from the tracking task. In the first experiment we varied whether the tracking or the IVT was emphasized, and in the second experiment we added instruction in the use of redundant displays. IVT messages varied in length. The results from 20 participants in each experiment revealed (a) an effect of priority on the tracking task only, suggesting that separate resources were used for each task, (b) an advantage for auditory over visual delivery only when the visual display was separated, suggesting that visual costs relate to peripheral, not central resources, (c) no benefit and sometimes noticeable costs for the redundant display, compared to the single modality displays in experiment 1, and (d) an improvement in performance with redundant displays when training was given in experiment 2. The results have a positive bearing on the use of head-up (adjacent) displays for complex information.
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