Fig. 2
From: Looming sounds are perceived as faster than receding sounds
Mean speed estimates for each speed and direction condition collapsed across the two distances. The interaction of stimulus speed and direction of travel was significant in (a) Experiment 1, within-subjects design (n = 77) and (b) between-subjects design (n = 200). In both studies listeners show significant speed discrimination for looming sounds but no difference in the perceived speed of receding sounds. Error bars represent 95 % confidence intervals. * p < 0.01, ** p < 0.05