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But instead of warning of a looming speed trap, cars ahead would alert those behind when a forward driver has slammed on the brakes, relaying a warning of an emergency ahead.
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We might also expect listeners to show better discrimination for the speed of looming sounds than for the speed of receding sounds because approaching sounds are more salient.
Listeners perceived the speed of looming sounds as faster than that of equivalent receding sounds.
Listeners also showed better discrimination of the speed of looming sounds than receding sounds.
The analysis revealed a main effect of Speed for looming sounds F (2,68) = 3.1, p = 0.05, η p 2 = 0.08, indicating that listeners could discriminate among the different speeds of looming sounds (See Fig. 2a).
In two studies this bias was shown to influence the perception of the speed of looming and receding sound sources.
Because "labeling" the speed of looming sounds is typically not a priority in a natural environment, the primary concern here was to examine relative differences between conditions rather than absolute estimates of speed.
Differential estimates of speed for looming versus receding sounds could provide additional support for Error Management Theory and be consistent with an evolutionary perspective on the role of adaptive processes in auditory perception.
The results suggest a prioritization of the perception of the speed of looming and receding sounds that mirrors the level of threat posed by moving objects in the environment.
In both studies listeners show significant speed discrimination for looming sounds but no difference in the perceived speed of receding sounds.
Separate follow-up ANOVAs for Looming and Receding conditions with Speed as the within-subjects variable indicated a main effect for Speed of looming sounds, F 2, 198) = 18.2, p < 0.001, η p 2 = 0.16, indicating that listeners could discriminate among the different speeds of looming sounds (See Fig. 2b).
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