Broader cochlear filters preserve envelope modulation power while electrode summation in CIs reduces it
Evidence
Because the smearing is due to wider filters, rather than envelope summation, the resultant envelopes from broader filters still have Rayleigh-distributed envelopes with the same overall relative modulation power as the envelopes from narrower filters (i.e., the same area under the modulation power spectrum, normalized to DC; see Fig. 1 ). In contrast, with CIs, the envelopes derived from summing the envelope currents from adjacent electrodes are no longer Rayleigh distributed and have lower modulation power, relative to the overall (DC) power in the envelope (Hu and Beaulieu 2005 ). — Dijk, Pim van, Physiology, Psychoacoustics and…, 2167
Categorization
Category: Causal Relationships
- XREF: Links to psychoacoustics of the modulation power spectrum and to why CI current spread degrades envelope cues.
- DEFINE: Explains Rayleigh-distributed envelope statistics and why filter broadening does not reduce total modulation power.
Related
- Widened cochlear filters preserve envelope modulation while CI electrode spread does not (similarity 0.93)
- Hearing-loss filter broadening preserves envelope statistics but CI current spread does not. (similarity 0.91)
- Broader cochlear filters shift noise modulation power away from speech-relevant low frequencies (similarity 0.88)
- Filter widening preserves Rayleigh envelope statistics while electrode-current summation does not. (similarity 0.84)
- Broader cochlear filtering reduces low-frequency noise fluctuations, explaining lost masking release (similarity 0.79)
Broader Connections
- Cochlear hearing loss spares envelope processing but amplifies perceived fluctuation via recruitment
#qualifies(0.80) — Dijk, Pim van, Physiology, Psychoacoustics and…, 816 - The envelope of each auditory filter output is processed by a modulation filterbank
#expands(0.75) — Dijk, Pim van, Physiology, Psychoacoustics and…, 3473