The Biological and Social Determinants of Child Development stimulates cross-disciplinary communication and research collaboration in the field of child development. While the papers in this issue seem diverse in terms of topic and discipline, there are a number of common themes: *critical period for brain development and the importance of specific environmental input during this period; *importance of early brain development and enriched environments is supported in articles describing findings from human studies; *potential for brain plasticity following specialized retraining is found...