Abstract
Fundamental frequency (F0) discrimination can be impaired substantially by the presence of another complex (the ‘‘fringe’’) immediately before and after the target complex. This has been attributed to listeners over-integrating information about the fringe F0 when estimating the target F0. It has been shown [C. Micheyl and R. P. Carlyon, J. Acoust. Soc. Am. (in press)] that for the impairment to occur (i) target and fringes have to be in the same frequency region; (ii) if all harmonics of target and fringes are unresolved then they may differ in F0; otherwise, they have to be similar. The present experiments investigated the effect of lateralized fringes. In a 2I-2AFC adaptive procedure, difference limens for F0 for a 100-ms harmonic target complex were measured in the presence and absence of 200-ms harmonic fringes. The nominal F0 was 88 or 250 Hz. Stimuli were bandpass-filtered between 125 and 625, 1375 and 1875, or 3900 and 5400 Hz. The target was presented monaurally, while the fringes were monaural (ipsilateral or contralateral) or binaural (diotic or dichotic, lateralized by ILD or ITD). Results showed reduced effects of fringes localized away from the target, the exact size depending on the resolvability of the components and their specific lateralization. [Work supported by Wellcome Trust.]
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