In normal twins the brainstem auditory evoked potential (BAEP) was recorded. The inter-individual variation of the I-V peak latency-interval within the twins appears to be of the same order of magnitude as the variation of the I-V peak latencies generally observed in infants. Consequently we conclude that in low-risk twins the inter-individual variation of the I-V peak latencies of the BAEP is maximally 0.4 msec and cannot be ascribed to a difference in postmenstrual age.