CUED Publications database

Perception of stochastic envelopes by normal-hearing and cochlear-implant listeners.

Gomersall, PA and Turner, RE and Baguley, DM and Deeks, JM and Gockel, HE and Carlyon, RP (2015) Perception of stochastic envelopes by normal-hearing and cochlear-implant listeners. Hear Res, 333. pp. 8-24.

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We assessed auditory sensitivity to three classes of temporal-envelope statistics (modulation depth, modulation rate, and comodulation) that are important for the perception of 'sound textures'. The textures were generated by a probabilistic model that prescribes the temporal statistics of a selected number of modulation envelopes, superimposed onto noise carriers. Discrimination thresholds were measured for normal-hearing (NH) listeners and users of a MED-EL pulsar cochlear implant (CI), for separate manipulations of the average rate and modulation depth of the envelope in each frequency band of the stimulus, and of the co-modulation between bands. Normal-hearing (NH) listeners' discrimination of envelope rate was similar for baseline modulation rates of 5 and 34 Hz, and much poorer than previously reported for sinusoidally amplitude-modulated sounds. In contrast, discrimination of model parameters that controlled modulation depth was poorer at the lower baseline rate, consistent with the idea that, at the lower rate, subjects get fewer 'looks' at the relevant information when comparing stimuli differing in modulation depth. NH listeners could discriminate differences in co-modulation across bands; a multidimensional scaling study revealed that this was likely due to genuine across-frequency processing, rather than within-channel cues. CI users' discrimination performance was worse overall than for NH listeners, but showed a similar dependence on stimulus parameters.

Item Type: Article
Uncontrolled Keywords: Cochlear implants Envelope discrimination Sound textures Acoustic Stimulation Acoustics Audiometry Auditory Perception Auditory Threshold Case-Control Studies Cochlear Implantation Cochlear Implants Cues Discrimination (Psychology) Electric Stimulation Humans Pattern Recognition, Physiological Persons With Hearing Impairments Psychoacoustics Signal Processing, Computer-Assisted Sound Spectrography Stochastic Processes
Divisions: Div F > Computational and Biological Learning
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:09
Last Modified: 17 May 2018 06:32