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🪵 The Threshold

Higher auditory thresholds predict smaller low-side suppression only at high signal levels

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tagsja-picks, question, xref, candy, causal_relationships, trade, corroborated, category/causal-relationships
aliases@van_dijk_physiology_2016, loc. 3812

4 min read

Higher auditory thresholds predict smaller low-side suppression only at high signal levels

Evidence

This suggests that suppression estimates were significantly greater when measured with a short combined masker. It is possible that the decreased suppression in the older adults was due to their increased auditory thresholds. To determine the effect of auditory threshold on suppression estimates, correlation coefficients were computed between threshold in dB HL and suppression estimates from each of the eight conditions tested. Out of the eight suppression conditions, threshold at 2 kHz was negatively correlated with low-side suppression at the 50-dB SPL signal level measured with the short combined masker [r (10) = − 0.68, p = 0.031] and with the long combined masker [r (10) = − 0.67, p = 0.33]. — Dijk, Pim van, Physiology, Psychoacoustics and…, 949

To determine the effect of auditory threshold on suppression estimates, correlation coefficients were computed between threshold in dB HL and suppression estimates from each of the eight conditions tested. Out of the eight suppression conditions, threshold at 2 kHz was negatively correlated with low-side suppression at the 50-dB SPL signal level measured with the short combined masker [r (10) = − 0.68, p = 0.031] and with the long combined masker [r (10) = − 0.67, p = 0.33]. This suggests that those with higher auditory thresholds had smaller low-side suppression estimates at the 50-dB SPL signal level. Otherwise, auditory threshold was not significantly correlated with either suppression or gain estimates. — Dijk, Pim van, Physiology, Psychoacoustics and…, 958

Dubno and Ahlstrom ( 2001a ) found a negative correlation between auditory thresholds and suppression estimates. In the present study, there was a negative correlation between auditory thresholds and suppression estimates for low-side suppression at the 50-dB SPL signal level. The correlation was not significant for low-side suppression at the 10-dB SL signal level or for high-side suppression. The suppression estimates in Dubno and Ahlstrom ( 2001a ) were measured between the narrowest and widest bandwidth maskers. This measure would include elements of both high-side and low-side suppression. It is possible that auditory threshold is more strongly correlated with low-side suppression. — Dijk, Pim van, Physiology, Psychoacoustics and…, 963

Suppression-threshold tuning curves showed sensitive low-side suppression for NH and HI animals. High-side suppression thresholds were elevated in HI animals, to the same extent as excitatory thresholds. — Dijk, Pim van, Physiology, Psychoacoustics and…, 3812

It is possible that the decreased suppression in the older adults was due to their increased auditory thresholds. To determine the effect of auditory threshold on suppression estimates, correlation coefficients were computed between threshold in dB HL and suppression estimates from each of the eight conditions tested. Out of the eight suppression conditions, threshold at 2 kHz was negatively correlated with low-side suppression at the 50-dB SPL signal level measured with the short combined masker [r (10) = − 0.68, p = 0.031] and with the long combined masker [r (10) = − 0.67, p = 0.33]. This suggests that those with higher auditory thresholds had smaller low-side suppression estimates at the 50-dB SPL signal level. — Dijk, Pim van, Physiology, Psychoacoustics and…, 958

Categorization

  • QUESTION: The low-side suppression correlates with threshold at 2 kHz but high-side suppression does not — why the asymmetry between low-side and high-side in threshold dependence?
  • CANDY: A snappy teaser: hearing damage spares one direction of a sound-suppression mechanism while degrading the other — low-side suppression is robust where high-side is not.
  • XREF: Relates to the broader literature tying age-related hearing loss (presbycusis) to reduced cochlear non-linearities including suppression, paralleling otoacoustic-emission findings. — connects to: Low-pass noise cutoff discrimination degrades with level while high-pass cutoff does not — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1074; Two-tone suppression lets strong signal components override weaker nearby ones; Broadened frequency tuning correlates with loss of suppression in auditory nerve fibers — Dijk, Pim van, Physiology, Psychoacoustics and…, 3871 (+2 more)
  • corroborated: 11 independent passages support this claim — Dijk, Pim van, Physiology, Psychoacoustics and…, 949; Dijk, Pim van, Physiology, Psychoacoustics and…, 958; Dijk, Pim van, Physiology, Psychoacoustics and…, 963 (+1 more)

Broader Connections

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