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In multi speakers environments, cochlear implant (CI) users may attend to atarget sound source in a different manner from the normal hearing (NH)individuals during a conversation. This study attempted to investigate theeffect of conversational sound levels on the mechanisms adopted by CI and NHlisteners in selective auditory attention and how it affects their dailyconversation. Nine CI users (five bilateral, three unilateral, and one bimodal)and eight NH listeners participated in this study. The behavioral speechrecognition scores were collected using a matrix sentences test and neuraltracking to speech envelope was recorded using electroencephalography (EEG).Speech stimuli were presented at three different levels (75, 65, and 55 dB SPL)in the presence of two maskers from three spatially separated speakers.Different combinations of assisted/impaired hearing modes were evaluated for CIusers and the outcomes were analyzed in three categories: electric hearingonly, acoustic hearing only, and electric+acoustic hearing. Our results showedthat increasing the conversational sound level degraded the selective auditoryattention in electrical hearing. On the other hand, increasing the sound levelimproved the selective auditory attention for the acoustic hearing group. In NHlisteners, however, increasing the sound level did not cause a significantchange in the auditory attention. Our result implies that the effect of thesound level on the selective auditory attention varies depending on hearingmodes and the loudness control is necessary for the ease of attending to theconversation by CI users.

The Spatial Selective Auditory Attention of Cochlear Implant Users in Different Conversational Sound Levels