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Abstract
Previous studies of auditory recognition memory in sleeping newborns reported 2 event-related potential (ERP) components, P2 and negative slow wave (NSW), reflecting voice discrimination and detection of novelty, respectively. In the present study, using high-density recording arrays, ERPs were acquired from 26 2-month-old awake infants as they were presented with a familiar and unfamiliar voice (i.e., mother and stranger) with equal probability. In addition to P2 and NSW, we observed a positive slow wave (PSW) over the right temporo-parietal scalp, indicating memory updating. Our study suggests that infants appear to have the capacity to encode novel stimuli as early as 2 months of age.
ACKNOWLEDGMENTS
We are very grateful to all the families who participated in the study.
The content of this article is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
This research was supported by grants from the National Natural Science Foundation of China (#30671773 to J. Shao) and the U.S. National Institutes of Health (P01 HD039386 to B. Lozoff and R01NS034458 to C. A. Nelson).