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Language experience enhances discrimination of speech contrasts at a behavioral, perceptual level, as well as at a pre-attentive level, as indexed by event-related potential (ERP) mismatch negativity (MMN) responses.The enhanced sensitivity could be the result of changes in acoustic resolution and/or long-term memory representations of the relevant information in auditory cortex.We used a short (ca.600 ms) versus long (ca.2600 ms) interstimulus interval in a passive, oddball discrimination task to examine these possibilities.