The efferent olivocochlear reflex takes 25-40 ms to begin acting

Evidence

The human MOCB response (as measured using otoacoustic emissions: OAEs) has an onset delay of between 25 and 40 ms and rise and decay time constants in the region of 280 and 160 ms, respectively (Backus and Guinan 2006 ). — Dijk, Pim van, Physiology, Psychoacoustics and…, 5953 (#corroborates, via linked claim)

The FDMC method avoids the confounds of previous forward-masking methods used to measure the efferent effect by using a combined duration of the masker-plus-signal stimulus of 25 ms, which is within the efferent onset delay. Hence, the representation of the signal should be unaffected by efferent activity elicited by the masker. The effect of efferent activation on cochlear gain can then be separately studied by presenting a precursor sound (to activate the efferent system) prior to the onset of the combined FDMC masker-signal stimulus. — Dijk, Pim van, Physiology, Psychoacoustics and…, 5953 (#expands, via linked claim)

Categorization

Category: Factual Claims

Related

• The human efferent reflex to sound has an onset delay of 25-40 ms (similarity 0.94)
• The human medial olivocochlear efferent reflex operates with specific millisecond timing constants. (similarity 0.90)
• Signal durations under the efferent onset delay isolate the efferent effect on cochlear gain (similarity 0.88)
• Medial olivocochlear efferent feedback reduces cochlear gain most for frequencies near the signal (similarity 0.84)
• Masking measured within the efferent onset delay isolates gain reduction cleanly (similarity 0.84)
• Medial olivocochlear reflex requires roughly 20-70 ms of sound to engage. (similarity 0.83)
• Masker duration gates whether the medial olivocochlear reflex contributes to measured gain (similarity 0.82)
• Medial olivocochlear efferents actively modulate cochlear gain during binaural listening (similarity 0.82)
• Psychoacoustic forward masking can probe the efferent reflex without its own contamination. (similarity 0.82)
• Brain efferents can dynamically adjust cochlear gain during listening (similarity 0.82)
• A 25 ms masker-plus-signal window isolates the signal from efferent feedback. (similarity 0.82)
• Sound durations longer than 25 ms recruit efferent feedback that reduces measured suppression (similarity 0.81)
• Masker durations over 25 ms trigger efferent feedback that reduces measured suppression (similarity 0.81)
• Medial olivocochlear reflex suppression requires maskers longer than 20 ms (similarity 0.80)
• The medial olivocochlear reflex inhibits cochlear compression contralaterally in a graded, output-dependent manner (similarity 0.80)

Broader Connections

• The human efferent reflex to sound has an onset delay of 25-40 ms #corroborates (1.00) — Dijk, Pim van, Physiology, Psychoacoustics and…, 5953
• Signal durations under the efferent onset delay isolate the efferent effect on cochlear gain #expands (0.85) — Dijk, Pim van, Physiology, Psychoacoustics and…, 5953