Masking measured within the efferent onset delay isolates gain reduction cleanly
Evidence
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
Categorization
- XREF: Relates to reading purpose on cognition/perception in normal hearing: how experimenters must time stimuli within an ~25 ms physiological delay to cleanly separate efferent from afferent contributions. — connects to: Suppression is underestimated by maskers long enough to trigger the MOCR; MOCR activation during long stimuli can reduce measured suppression; Long suppressor durations elicit MOCR and may underestimate suppression (+2 more)
- corroborated: 2 independent passages support this claim — Dijk, Pim van, Physiology, Psychoacoustics and…, 5953