Auditory neuropathy elevates gap detection thresholds threefold above normal

Evidence

Welch’s test in a one-way ANOVA found significant differences of TGD thresholds among the three groups of subjects [F(2,56) = 9.9, p < 0.001]. Post hoc Tamhane’ T2 correction test analysis indicated that the mean TGD thresholds for both ears was significantly higher in the listeners with ANSD (11.9 ms) than in the listeners with SNHL (4.0 ms; p < 0.001) and in the NH (3.9 ms; p < 0.001) listeners; while the subjects with SNHL had the TGD thresholds close to normal. It is notable that the variability in TGD thresholds for the ANSD subjects was very large, ranging from normal limits to 10 times the norm. — Dijk, Pim van, Physiology, Psychoacoustics and…, 3380

It is notable that the variability in TGD thresholds for the ANSD subjects was very large, ranging from normal limits to 10 times the norm. This result indicates that the SNHL subjects had normal temporal resolution as long as the audibility was compensated, but a majority of the subjects with ANSD had poor temporal resolution in the present study. — Dijk, Pim van, Physiology, Psychoacoustics and…, 3380

Figure 3 shows the averaged TGD thresholds of both ears for the three groups of subjects. Welch’s test in a one-way ANOVA found significant differences of TGD thresholds among the three groups of subjects [F(2,56) = 9.9, p < 0.001]. Post hoc Tamhane’ T2 correction test analysis indicated that the mean TGD thresholds for both ears was significantly higher in the listeners with ANSD (11.9 ms) than in the listeners with SNHL (4.0 ms; p < 0.001) and in the NH (3.9 ms; p < 0.001) listeners; while the subjects with SNHL had the TGD thresholds close to normal. It is notable that the variability in TGD thresholds for the ANSD subjects was very large, ranging from normal limits to 10 times the norm. This result indicates that the SNHL subjects had normal temporal resolution as long as the audibility was compensated, but a majority of the subjects with ANSD had poor temporal resolution in the present study. — Dijk, Pim van, Physiology, Psychoacoustics and…, 3404

Categorization

• SHARE: The striking dissociation — SNHL hurting frequency resolution but sparing gap detection, ANSD exactly reversed, with ANSD gap thresholds spanning normal to 10x normal — is a sharp clinical-audiology nugget.
• XREF: Directly extends the cochlear-normal-but-neural-impaired dissociation from passage 3399: together they confirm that ANSD selectively spares frequency resolution while degrading temporal processing. — connects to: Elevated gap detection thresholds in hearing loss stem from threshold elevation, not temporal pathology — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 964; Auditory neuropathy impairs temporal gap detection while SNHL patients stay near normal.; Gap detection and amplitude modulation remain intact in sensorineural hearing loss (+4 more)
• corroborated: 4 independent passages support this claim — Dijk, Pim van, Physiology, Psychoacoustics and…, 3380; Dijk, Pim van, Physiology, Psychoacoustics and…, 3404

Broader Connections

• Auditory neuropathy impairs temporal gap detection while SNHL patients stay near normal. #corroborates (0.85)
• Elevated gap detection thresholds in hearing loss stem from threshold elevation, not temporal pathology #complicates (0.82) — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 964
• Gap detection and amplitude modulation remain intact in sensorineural hearing loss #corroborates (0.80)
• Auditory neuropathy presents with milder hearing loss than sensorineural loss yet worse temporal processing #corroborates (0.80)
• Auditory neuropathy disrupts nerve firing synchrony while preserving cochlear amplification #expands (0.78)
• Auditory neuropathy severely impairs fine-structure processing while preserving envelope use #expands (0.75)
• Mandarin tone perception accuracy falls from 97 percent to 63 percent in auditory neuropathy #expands (0.72)