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Measurement of pitch perception as a function of cochlear implant electrode and its effect on speech perception with different frequency allocations

Measurement of pitch perception as a function of cochlear implant electrode and its effect on speech perception with different frequency allocations
Measurement of pitch perception as a function of cochlear implant electrode and its effect on speech perception with different frequency allocations
An experiment was conducted to investigate the possibility that speech perception could be improved for some cochlear implant (CI) users by adjustment of the frequency allocation to the electrodes, following assessment of pitch perception along the electrode array. Thirteen adult CI users with MED-EL devices participated in the study. Pitch perception was assessed for individual CI electrode pairs using the Pitch Contour Test (PCT), giving information on pitch discrimination and pitch ranking for adjacent electrodes. Sentence perception in noise was also assessed with ten different frequency allocations, including the default. Pitch perception was found to be poorer for both discrimination and ranking scores at either end of the electrode array. A significant effect of frequency allocation was found for sentence scores [F(4.24,38.2)=7.14, p<0.001] and a significant interaction between sentence score and PCT ranking score for basal electrodes was found [F(4.24,38.2)=2.95, p=0.03]. Participants with poorer pitch perception at the basal end had poorer scores for some allocations with greater basal shift. The results suggest that speech perception could be improved for CI users by assessment of pitch perception using the PCT and subsequent adjustment of pitch-related stimulation parameters.
Cochlear implant, Pitch Perception, Speech Perception, Psychoacoustics/Hearing Science
Grasmeder, Mary
206e6b44-d1cd-43f5-99ac-588ab02d44ef
Verschuur, Carl
5e15ee1c-3a44-4dbe-ad43-ec3b50111e41
Van Besouw, Rachel
464435ed-eadc-4fcc-9d69-eb267d8fe81b
Wheatley, Anne M.H.
9a93bd7d-e1fc-4bca-811b-a9760841672b
Newman, Tracey
322290cb-2e9c-445d-a047-00b1bea39a25
Grasmeder, Mary
206e6b44-d1cd-43f5-99ac-588ab02d44ef
Verschuur, Carl
5e15ee1c-3a44-4dbe-ad43-ec3b50111e41
Van Besouw, Rachel
464435ed-eadc-4fcc-9d69-eb267d8fe81b
Wheatley, Anne M.H.
9a93bd7d-e1fc-4bca-811b-a9760841672b
Newman, Tracey
322290cb-2e9c-445d-a047-00b1bea39a25

Grasmeder, Mary, Verschuur, Carl, Van Besouw, Rachel, Wheatley, Anne M.H. and Newman, Tracey (2018) Measurement of pitch perception as a function of cochlear implant electrode and its effect on speech perception with different frequency allocations. International Journal of Audiology. (doi:10.1080/14992027.2018.1516048).

Record type: Article

Abstract

An experiment was conducted to investigate the possibility that speech perception could be improved for some cochlear implant (CI) users by adjustment of the frequency allocation to the electrodes, following assessment of pitch perception along the electrode array. Thirteen adult CI users with MED-EL devices participated in the study. Pitch perception was assessed for individual CI electrode pairs using the Pitch Contour Test (PCT), giving information on pitch discrimination and pitch ranking for adjacent electrodes. Sentence perception in noise was also assessed with ten different frequency allocations, including the default. Pitch perception was found to be poorer for both discrimination and ranking scores at either end of the electrode array. A significant effect of frequency allocation was found for sentence scores [F(4.24,38.2)=7.14, p<0.001] and a significant interaction between sentence score and PCT ranking score for basal electrodes was found [F(4.24,38.2)=2.95, p=0.03]. Participants with poorer pitch perception at the basal end had poorer scores for some allocations with greater basal shift. The results suggest that speech perception could be improved for CI users by assessment of pitch perception using the PCT and subsequent adjustment of pitch-related stimulation parameters.

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Grasmeder PCT and Cochlear Implant frequency allocation IJA - Accepted Manuscript
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More information

Accepted/In Press date: 13 August 2018
e-pub ahead of print date: 27 October 2018
Keywords: Cochlear implant, Pitch Perception, Speech Perception, Psychoacoustics/Hearing Science

Identifiers

Local EPrints ID: 424227
URI: http://eprints.soton.ac.uk/id/eprint/424227
PURE UUID: 3f882eb2-f86b-42fa-a9fc-8235dd9611b0
ORCID for Tracey Newman: ORCID iD orcid.org/0000-0002-3727-9258

Catalogue record

Date deposited: 05 Oct 2018 11:35
Last modified: 29 Oct 2019 05:09

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