Does the tinnitus pitch correlate with the frequency of hearing loss?

BACKGROUND

The tonotopic model of tinnitus claims that the tinnitus pitch corresponds to the audiometric edge; the homeostatic model suggests that it falls within the hearing loss (HL) area. The existing evidence mostly supports the homeostatic model, but the relationship between the tinnitus pitch and the HL frequencies has been insufficiently explored.

AIMS/

OBJECTIVE

To investigate the association between the tinnitus pitch and the audiometric profile in the largest study population to date.

MATERIALS AND

METHODS

Three hundred and ninety-three patients with tonal or narrow-band tinnitus participated. HL frequencies included 30, 40, 50 (F50), 60 dB, and maximum HL. We defined edge frequencies in four different ways according to the existing studies. We assessed the association between all estimated frequencies and the tinnitus pitch using t-tests, Spearman's correlation, and multiple regression.

RESULTS

All calculated frequencies differed significantly from the tinnitus pitch except for F50. None were correlated with the tinnitus pitch. F50 was the only significant predictor among the estimated frequencies in multiple regression.

CONCLUSIONS

The tinnitus pitch fell within the HL area, and was mildly associated with F50.

SIGNIFICANCE: Our results support the homeostatic tinnitus model, and provide reliable evidence that tinnitus pitch does not correspond to the audiometric edge.