Sound and Time (12-01-21)

Carlini and Bigand looked at relationships between sounds heard and the accuracy of estimations of how long an object being looked at moved.  They report that “A visual moving target was presented to the participants, associated with a concurrent sound. . . . Nine different sound profiles were tested, from an easier constant sound to more variable and complex pitch profiles, always presented synchronously with motion. Participants’ responses show that constant sounds produce the worst duration estimation performance, even worse than the silent condition; more complex sounds, instead, guarantee significantly better performance. . . .  Results clearly show that a concurrent sound influences the unified perception of motion; the type and magnitude of the bias depends on the structure of the sound stimulus. Contrary to expectations, the best performance is not generated by the simplest stimuli, but rather by more complex stimuli that are richer in information.”

Alessandro Carlini and Emmanuel Bigand.  2021.  “Does Sound Influence Perceived Duration of Visual Motion.”  Frontiers in Psychology,