Discrimination of speech sound contrasts determined with behavioral tests and event-related potentials in cochlear implant recipients.
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.
Beynon
A J
AJ
Cochlear Implant Centre Nijmegen/St. Michielsgestel--ENT Dept., University Medical Centre Nijmegen, the Netherlands. a.beynon@kno.umcn.nl
Snik
A F M
AF
Stegeman
D F
DF
van den Broek
P
P
D000161:Acoustic Stimulation / Q000379:methods; D000328:Adult; D000368:Aged; D003054:Cochlear Implants; D005072:Evoked Potentials, Auditory; D005260:Female; D034381:Hearing Loss / Q000534:rehabilitation; D006801:Humans; D008297:Male; D008875:Middle Aged; D013067:Speech Perception / Q000502:physiology*; D013223:Statistics as Topic