Gockel et al. [(2004). J. Acoust. Soc. Am. 116, 1092-1104] reported that discrimination of the fundamental frequency (F0) of two sequentially presented complex tones (the target) was impaired when an additional complex tone (the interferer) was presented simultaneously with and to the same ear as the target, even though the target and interferer were filtered into separate frequency regions. This pitch discrimination interference (PDI) was greatest when the target and interferer had similar F0s. The current study examined the role of relative ear of entry of the target and interferer and whether the dependence of the PDI effect on the relative F0 of target and interferer is based on pitch height (F0 as such) or pitch chroma (the musical note). Sensitivity (d(')) was measured for discrimination of the F0 of a target with a nominal F0 of 88 Hz, bandpass filtered from 1375 to 1875 Hz. The interferer was bandpass filtered from 125 to 625 Hz. The contralateral interferer produced marked PDI, but smaller than for ipsilateral presentation. PDI was not larger when the interferer's F0 was twice the nominal target F0 than when it was a factor of 1.9 or 2.1 higher.
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