Nunn, TB; Green, T; Jiang, D; Boyle, P; Vickers, DA; (2019) Assessment of adjustment to electrical threshold (T) level and electrical stimulation rate on intensity discrimination and amplitude modulation detection at soft presentation level in adult CI users. In: Proceedings of the 23rd International Congress on Acoustics: integrating 4th EAA Euroregio 2019. (pp. pp. 6529-6535). Deutsche Gesellschaft für Akustik: Berlin.

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Abstract

© 2019 Proceedings of the International Congress on Acoustics. All rights reserved. A pilot study was conducted to evaluate the influence of electrical stimulation rate and the setting of electrical threshold (T) level on intensity difference limens (IDLs) and amplitude modulation (AM) perception. Participants were ten adult experienced Advanced Bionics cochlear implant (CI) users. The frequency of acoustic sinusoidal stimuli was set at 1076Hz with the intention of stimulating intra-cochlear electrode 7 of the 16 electrode array. Nine experimental maps were created with T levels set at: the threshold of audibility; a level perceived as 'very soft' and 10% of the level judged to produce 'most comfortable loudness'. Rates of electrical stimulation were 905, 1811 and 2750 pulses-per-second (pps). Adaptive 2I-2AFC IDL and AM perception tasks were presented via headphones at soft presentation levels (approximately 50dBSPL). The influence of T Level and stimulation rate adjustments on IDL and AM perception have been explored with the intention of understanding the impact of altering individual parameter settings to optimise detection of acoustic cues at low presentation levels.

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