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Speech ABR Analysis

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Introduction Young and Sachs (1) showed that speech formants are conserved in the auditory nerve discharge pattern. Following their work, Greenberg (2) used complex stimuli to record speech ABR. He demonstrated that vowel formants can be truly encoded in the auditory brainstem response. (2) This stimulus reliability was further confirmed by Galbraith et al. who showed that words elicit a speech ABR that can be heard (3, 4) Many complex stimuli have been investigated to assess how the temporal and spectral features of sound stimuli are maintained in the auditory brainstem response. The two most meticulously studied are the consonant-vowel (CV) /da/ (5-24) and different Mandarin syllables as /yi/ and /mi/. (19, 25-30) Other speech syllable stimuli, /ba/, /ga/, have been used in some studies for speech ABR …show more content…

Measurement of speech ABR in cochlear implant (CI) subjects is technically difficult due to the following reasons: Using a speaker to present the stimulus will increase the likelihood of occurrence of stimulus artifact. Speech ABR when measured using short duration stimuli as 40 msec /da/ will be more liable to be masked by a stimulus artifact since the response occurs early contrary to middle latency response and cortical potentials. Also the risk of occurrence of stimulus artifact is more in CI subjects in an ipsilateral recording electrode montage because the reference electrode will pick up electromagnetic waves reaching the electrode site from the speaker. Recording speech ABR via a speaker will also increase the possibility of subtle intensity changes due to head movements. The latency of the response will depend on the distance between the speaker and the CI subject. This problem can be solved by marking the location of the chair and speaker and measuring the distance each time a subject is

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