Pure-tone pitch anomalies. I. Pitch-intensity effects and diplacusis in normal ears

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Abstract
Pitch-intensity functions were obtained in both ears of 5 normal-hearing [human] subjects, together with measurements of binaural diplacusis as a function of intensity. Pitch intensity functions are often significantly different in the 2 ears of a given subject at a given frequency. For each subject and frequency condition tested, an intensity existed for which no significant diplacusis was found. For these conditions, binaural diplacusis as a function of intensity could be accounted for by the interaural differences in pitch-intensity functions. Forward-masking patterns (FMP) as a function of intensity were also obtained in both ears of several subjects. The FMP were compared with pitch intensity functions, obtained for the same conditions, for evidence of a covariation in the direction of shifts in masking patterns as a function of intensity with the direction of pitch shifts as a function of intensity. No convincing evidence of such a covariation was found. The implications of the results of these experiments are discussed relative to the question of temporal vs. tonotopic coding of pure-tone pitch.

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