Abstract
The effects of sound duration on event-related potentials (ERP) were studied in newborns and adults. Increasing tone duration from 200 to 300 ms led to the enhancement of the N2 peak amplitude, whereas two peaks became distinguishable in the N2 response elicited by 400 ms long tones. The sound-duration related ERP changes most likely reflect contribution from the sustained potential, although the observed results can also be explained by assuming the elicitation of a sound-duration sensitive frontocentrally negative ERP component (duration-sensitive N2; DN2). The pattern of duration-related changes observed in newborn infants was very similar to that in adults, regardless of the structural differences between adult and infant ERPs. The results suggest that sound duration is processed already at birth in a similar way as in adulthood.
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