Comparing linear off-frequency and compressive on-frequency maskers estimates cochlear gain

Evidence

Previous studies have examined the relationship between ANF 2TS and chronic low-level noise exposure coupled with ageing in the Mongolian gerbil (Schmiedt et al. 1990 ; Schmiedt and Schultz 1992 ), and following an acute intense noise exposure in the cat (Miller et al. 1997 ). Ageing in a noisy environment was associated with a loss of 2TS. Schmiedt and colleagues often found complete absence of high-side 2TS, with sparing of low-side 2TS, even in cochlear regions with up to 60 % outer-hair-cell loss; suggesting potentially different mechanisms for lowand high-side suppression. — Dijk, Pim van, Physiology, Psychoacoustics and…, 3876 (#expands, via linked claim)

When suppression is measured with combined maskers long enough to elicit MOCR-induced gain reduction, suppression may be underestimated. However, even when measured with the shorter combined maskers, older adults had less suppression than younger adults. Evidence from animal studies suggests that gain reduction from the MOCR and suppression interact, resulting in decreased suppression (Winslow and Sachs 1987 ; Kawase et al. 1993 ). — Dijk, Pim van, Physiology, Psychoacoustics and…, 959 (#qualifies, via linked claim)

Categorization

• corroborated: 2 independent passages support this claim
• XREF: connects to: Measured suppression is underestimated when maskers trigger medial-olivocochlear gain reduction — Dijk, Pim van, Physiology, Psychoacoustics and…, 959; High- and low-side suppression rest on different cochlear mechanisms — Dijk, Pim van, Physiology, Psychoacoustics and…, 3876; Masking experiments infer auditory representation from masker effects on signals. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 441 (+2 more)

Related

• Measured suppression is underestimated when maskers trigger medial-olivocochlear gain reduction (similarity 0.88)
• Suppression is underestimated by maskers long enough to trigger the MOCR (similarity 0.87)
• High- and low-side suppression rest on different cochlear mechanisms (similarity 0.87)
• Masker duration gates whether the medial olivocochlear reflex contributes to measured gain (similarity 0.86)
• Long combined maskers trigger MOCR gain reduction that underestimates true suppression (similarity 0.86)
• MOCR gain reduction masks true cochlear suppression and underestimates it (similarity 0.86)
• Suppression-based gain estimates compare on-frequency masker thresholds against off-frequency baselines (similarity 0.85)
• Older adults show reduced cochlear two-tone suppression (similarity 0.85)
• Two-tone suppression is an instantaneous reduction of basilar membrane response (similarity 0.84)
• Reducing audible fluctuations in a masker lowers post-masked thresholds by up to 24 dB (similarity 0.83)
• Older adults show significantly lower cochlear gain estimates than younger adults (similarity 0.83)
• Prior suppression studies may be confounded because long stimuli trigger the medial olivocochlear reflex (similarity 0.83)
• Higher auditory thresholds predict smaller low-side suppression only at high signal levels (similarity 0.82)
• MOCR gain reduction interacts with suppression to reduce it (similarity 0.82)
• Reduced frequency selectivity partly explains diminished sensitivity to inherent masker fluctuations (similarity 0.82)

Broader Connections

• Off-frequency listening can distort auditory filter measurement unless masked #corroborates (0.82)
• High- and low-side suppression rest on different cochlear mechanisms #expands (0.80) — Dijk, Pim van, Physiology, Psychoacoustics and…, 3876
• Measured suppression is underestimated when maskers trigger medial-olivocochlear gain reduction #qualifies (0.78) — Dijk, Pim van, Physiology, Psychoacoustics and…, 959
• Masking experiments infer auditory representation from masker effects on signals. #expands (0.72) — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 441