A 25 ms masker-plus-signal window isolates the signal from efferent feedback.
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
Category: Craft and Method
Related
- Psychoacoustic forward masking can probe the efferent reflex without its own contamination. (similarity 0.93)
- Masking measured within the efferent onset delay isolates gain reduction cleanly (similarity 0.92)
- Signal durations under the efferent onset delay isolate the efferent effect on cochlear gain (similarity 0.90)
- Efferent gain effects were mapped by precursors swept across nine centre frequencies (similarity 0.84)
- Efferent cochlear gain reduction is greatest when the precursor matches the signal frequency (similarity 0.82)
- Masking effectiveness depends on masker-signal power, frequency, and timing relationships (similarity 0.82)
- The efferent olivocochlear reflex takes 25-40 ms to begin acting (similarity 0.82)
- Masker durations over 25 ms trigger efferent feedback that reduces measured suppression (similarity 0.81)
- Otoacoustic and psychophysical estimates of efferent gain disagree due to stimulus constraints (similarity 0.79)
- Masker effectiveness is determined solely by power falling within one auditory filter. (similarity 0.79)
- The band-widening paradigm measures signal threshold while varying masker bandwidth (similarity 0.78)