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Effects of ear entry and perceived location of synchronous and asynchronous components on mistuning detection.
Journal of the Acoustical Society of America 104 (6), December 1998, 3534- 3545.
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Listeners had to detect mistuning in complex tones. Mistuning was produced by inverting the phase of the frequency modulation of a target component relative to the frequency modulation of the nontarget components. Earlier findings using monaural presentation showed elevation of thresholds in the presence of unmodulated asynchronous interferers with frequency identical to the mean frequency of the target. This was attributed to the interferer, causing the target component to be perceptually segregated from the remainder of the complex, thereby impairing across-frequency comparisons. In three experiments it was shown that (i)contralateral interferers also impaired performance, but to a lesser extent than ipsilateral ones; (ii) dichotic interferers (presented with an interaural level difference, so that they were perceived contralaterally) had the same (large) effect as if presented ipsilaterally; (iii) in the absence of any interferer, performance was determined by whether the target was presented to the same ear as the remainder of the complex, rather than by its perceived location.