One sound or two? Object-related negativity indexes echo perception.
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The ability to isolate a single sound source among concurrent sources and reverberant energy is necessary for understanding the auditory world. The precedence effect describes a related experimental finding, that when presented with identical sounds from two locations with a short onset asynchrony (on the order of milliseconds), listeners report a single source with a location dominated by the lead sound. Single-cell recordings in multiple animal models have indicated that there are low-level mechanisms that may contribute to the precedence effect, yet psychophysical studies in humans have provided evidence that top-down cognitive processes have a great deal of influence on the perception of simulated echoes. In the present study, event-related potentials evoked by click pairs at and around listeners' echo thresholds indicate that perception of the lead and lag sound as individual sources elicits a negativity between 100 and 250 msec, previously termed the object-related negativity (ORN). Even for physically identical stimuli, the ORN is evident when listeners report hearing, as compared with not hearing, a second sound source. These results define a neural mechanism related to the conscious perception of multiple auditory objects.
Published Version (Please cite this version)10.3758/PP.70.8.1558
Publication InfoFreyman, RL; Joh, Amy S; Keen, RE; & Sanders, LD (2008). One sound or two? Object-related negativity indexes echo perception. Percept Psychophys, 70(8). pp. 1558-1570. 10.3758/PP.70.8.1558. Retrieved from https://hdl.handle.net/10161/6387.
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