MMN And P3 Auditory Evoked Potentials within and Across Phonetic Categories

摘要

The mismatch negativity (MNfN) and P3O0 of the auditory evoked responsepotentials were studied within and across phonetic categories of /ba/ and /pa/ differing in voice onset time. The MMN and P300 responses were present in all within and across phonetic conditions suggesting a discrimination at both temporal areas of the ERP. There were no differences in the MMN amplitude or latency measures. P3OO amplitude was found to be significantly larger for the across category conditions. These results suggest that ategorical processing may not occur in the temporal domain of the NfMN and may first occur in the time period of the P3OO. Measures of acoustic discrimination and linguistic categorization at the level of central processing are of great clinical value.