TY - GEN
T1 - Electrophysiological and psychophysical measures of amplitude modulation discrimination in cochlear implant users
AU - Vickers, Deborah A.
AU - Moore, Brian C. J.
AU - Boyle, Patrick
AU - Schlittenlacher, Josef
AU - van Yper, Lindsey
AU - Undurraga, Jaime
N1 - Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.
PY - 2019
Y1 - 2019
N2 - Cochlear implants (CIs) work by dividing the incoming acoustic signal into a limited number of frequency channels, extracting the slowly varying amplitude envelope in each channel and using this to modulate the level of electrical pulses delivered to the auditory nerve fibres. The amplitude modulation (AM) cues that are transmitted are crucial for speech understanding and an individual's abilities to perceive different rates of AM is related to speech perception. The use of these cues can be affected by interference from adjacent channels caused by current spread which is further exacerbated if traumatic electrode placement or poor neural survival occurs. We have tested eleven adult CI users with a psychophysical measure of across-channel modulation interference (AMCI), to determine discrimination of different rates of AM in the presence of interferers and an electrophysiological correlate, the electrically-evoked auditory change complex (eACC).The eACC is a cortical potential in response to a change in an ongoing stimulus,i.e. AM rate change. Ability to discriminate AM rate (based on AMCI and eACC) is related to speech perception. If eACC to AM rate changes can be developed it can be used with children and also to identify poorly discriminated CI electrodes, to guide re-mapping.
AB - Cochlear implants (CIs) work by dividing the incoming acoustic signal into a limited number of frequency channels, extracting the slowly varying amplitude envelope in each channel and using this to modulate the level of electrical pulses delivered to the auditory nerve fibres. The amplitude modulation (AM) cues that are transmitted are crucial for speech understanding and an individual's abilities to perceive different rates of AM is related to speech perception. The use of these cues can be affected by interference from adjacent channels caused by current spread which is further exacerbated if traumatic electrode placement or poor neural survival occurs. We have tested eleven adult CI users with a psychophysical measure of across-channel modulation interference (AMCI), to determine discrimination of different rates of AM in the presence of interferers and an electrophysiological correlate, the electrically-evoked auditory change complex (eACC).The eACC is a cortical potential in response to a change in an ongoing stimulus,i.e. AM rate change. Ability to discriminate AM rate (based on AMCI and eACC) is related to speech perception. If eACC to AM rate changes can be developed it can be used with children and also to identify poorly discriminated CI electrodes, to guide re-mapping.
UR - http://www.scopus.com/inward/record.url?scp=85099331540&partnerID=8YFLogxK
UR - http://pub.dega-akustik.de/ICA2019/data/index.html
U2 - 10.18154/RWTH-CONV-239686
DO - 10.18154/RWTH-CONV-239686
M3 - Conference proceeding contribution
AN - SCOPUS:85099331540
T3 - Proceedings of the International Congress on Acoustics
SP - 2220
EP - 2226
BT - Proceedings of the 23rd International Congress on Acoustics
A2 - Ochmann, Martin
A2 - Michael, Vorlander
A2 - Fels, Janina
PB - International Commission for Acoustics (ICA)
CY - Germany
T2 - 23rd International Congress on Acoustics: Integrating 4th EAA Euroregio, ICA 2019
Y2 - 9 September 2019 through 13 September 2019
ER -