Discrimination of speech sound contrasts determined with behavioral tests and event-related potentials in cochlear implant recipients.
SourceJournal of the American Academy of Audiology, 16, 1, (2005), pp. 42-53
Article / Letter to editor
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Journal of the American Academy of Audiology
SubjectDCN 1: Perception and Action; DCN 2: Functional Neurogenomics; UMCN 3.2: Cognitive neurosciences; UMCN 3.3: Neurosensory disorders
Cortical potentials evoked with speech stimuli were investigated in ten experienced cochlear implant (CI, type Nucleus 24M) users using three different speech-coding strategies and two different speech contrasts, one vowel (/i/-/a/) and one consonant (/ba/-/da/) contrast. On average, results showed that, compared to subjects with normal hearing, P300 amplitudes were smaller; however, most latencies were within the normal range. Next, individual P300 measures in response to the two speech contrasts were compared to behavioral discrimination scores. Significant within-subject differences in P300 amplitudes and latencies were found for the three speech coding strategies. These differences were in agreement with the behavioral, strategy-dependent discrimination of the speech contrasts.
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