A series of experiments that investigate the relative roles of physical motion and changing sound source intensity cues to the perception of linear self-motion. Self-motion was simulated using either (i) physical motion only, (ii) simulated auditory motion only, (iii) physical motion coupled with auditory motion, or (iv) physically moving audio only. In all conditions an over-estimation of self-motion was observed that varied systematically with the simulated acceleration. Of particular interest was that auditory cues combined with physical motion cues resulted in more accurate estimates of self-motion than did either auditory or physical motion cues in isolation.

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