Effect of Audiometric Configuration on Binaural Temporal Fine Strucure Sensitivity in Adults with Sensorneural Hearing Loss
Abstract
Background and Aim: Temporal fine structure (TFS) cues are crucial for pitch perception, sound localization, and speech understanding in noise. Hearing loss can impair TFS sensitivity, but the role of audiometric configuration remains unclear. This study compared binaural TFS sensitivity between adults with sloping and rising/flat sensorineural hearing loss (SNHL).
Methods: This cross-sectional study included 47 adults (32 sloping, 15 rising/flat) aged 18–50 with bilateral mild to moderate SNHL (26–55 dB HL). All participants had normal outer and middle ear status, were right-handed, and had no cognitive impairment. TFS sensitivity was measured using the TFS- Low Frequency (TFS-LF) test at 250, 500, and 750 Hz, and the TFS- Adaptive Frequency (TFS-AF) test at interaural phase differences (IPDs) of 45° and 135°.
Results: For the TFS-LF test, average thresholds were poorer in the sloping group at all frequencies, but differences were insignificant (p > 0.05). For the TFS-AF test, thresholds at IPD 135° were significantly higher than at IPD 45° (p < 0.001), with no significant group effect. Significant correlations were observed between the thresholds of the TFS-LF and the TFS-AF test.
Conclusion: Based on the results of the TFS-LF and TFS-AF tests, there is no significant difference in TFS sensitivity between the two groups. Furthermore, TFS sensitivity is not determined solely by absolute hearing thresholds across different frequencies, and factors like age, cochlear health, neural timing, and individual variability may also affect outcomes.
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Keywords | ||
Temporal fine structure sensorineural hearing loss configuration interaural phase difference |
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