High Ripple-Density Resolution for Discriminating Between Rippled and Nonrippled Signals: Effect of Temporal Processing or Combination Products?
Dmitry I Nechaev, Olga N Milekhina, Marina S Tomozova and 1 others
PMID 33926309WHAT IT FOUND
Listeners distinguished rippled from nonrippled sounds at much higher ripple densities than two rippled sounds.
Masking low frequencies did not close this gap. The advantage likely comes from how the ear processes timing, not from distortion products.
Key findings
01Ripple-density resolution was substantially higher when discriminating a rippled signal from a nonrippled reference (21.8 ripples/oct) compared to discriminating between two rippled references (9.8 ripples/oct).
02Low-frequency maskers reduced resolution in both tasks but did not eliminate the significant difference between the rippled and nonrippled reference conditions at levels up to 10 dB above the signal.
03The persistence of the performance gap despite masking suggests that combination products play a negligible role, supporting temporal processing as the mechanism for the higher resolution.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
Very small sample size (n=6). Laboratory setting with simple noise signals, not speech or music. Findings are specific to the frequency range and ripple types tested. Does not assess clinical populations with hearing loss.
Declared interests
No potential conflicts of interest declared. Funded by the Russian Foundation for Basic Research.
The easy way to misread this
Do not interpret the high ripple-density resolution as a measure of speech understanding. This task relies on specific temporal or spectral cues in noise that do not directly translate to everyday listening performance.