Abstract
This proof-of-concept study evaluated appropriate modalities and respective stimuli for a curvewarning application. Objective and subjective measurements were collected in a simulator environment to compare conditions comprised of multiple stimuli from auditory (icon, tone, or speech), visual (Heads Down Display [HDD] or Heads Up Display [HUD]), and haptic (throttle push-back) modalities. The speech stimulus was shown to be the most appropriate auditory stimulus both objectively and subjectively. The HDD and HUD were found to be comparable in terms of objective performance, although the HDD ranked higher for subjective measurements. The throttle push-back had little positive impact on performance, which combined with subjective findings, makes it less suitable for a curve-warning application. The Speech and HDD condition was the most effective combination of two and three modalities examined.
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