The interactional model of human development recognizes that each child has a genetic potential that is shaped through life experiences.1 Central nervous system (CNS) attributes are inherited, but a warm, nurturing, and loving environment is necessary for the individual to reach his or her maximum fulfillment. It is the role of the family physician to follow the neurodevelopment of the child from infancy into adulthood and to identify significant deviations from the norm. The interactional model allows consideration of biologic and psychosocial factors in the etiology of abnormal development (Table 17.1).
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