Quality of attachment, disorganization in attachment, and the contribution of caregiver interactions in the home were investigated for infants prenatally exposed to PCP and cocaine and their caregivers. The drug-exposed infants were compared with infants of similar ethnicity, socioeconomic status (SES), and living in the same geographical area of the city with non-substance-abusing mothers. The majority of drug-exposed infants were insecurely attached to their caregivers and did not differ in the percentage of security in the three caregiving environments in which the infants were growing up: biologic mother care, kinship care, or foster mother care. The majority of drug-exposed children were disorganized. Change in caregivers during the first year was not found to be related to the rate of insecurity in any of the caregiving environments. The majority of the non-drug-exposed comparison infants were securely attached, and only a small percentage were disorganized. The high incidence of insecurity in the drug-exposed group is discussed in relation to maternal and environmental circumstances that can alter the assumption of security in attachment for the majority of children and caregivers toward insecurity in attachment.

The relation between caregiver intrusiveness and the quality of attachment was tested among 51 prenatally drug-exposed toddlers and their primary caregivers. Biological mothers and kinship/foster caregivers neither differed as to caregiver intrusiveness nor as to their toddlers' attachment security and attachment organization. Insecure and disorganized/disoriented attachments were found to be more prevalent in this sample than in normal samples. In keeping with recent findings in non-drug-abusing samples (Isabella & Belsky, 1991; Lyons-Ruth, Repacholi, McLeod, & Silva, 1991), more caregivers of toddlers with avoidant or disorganized/disoriented attachments were found to be intrusive than caregivers of toddlers with secure or resistant attachments.

Prenatally drug-exposed toddlers were compared to preterm toddlers of similar low socioeconomic status, ethnicity, and single-parent households on intellectual functioning, quality of play, and security of attachment to the primary caregiver. The drug-exposed toddlers had significantly lower developmental scores, less representational play, and the majority had insecure, disorganized, avoidant attachments. In all areas investigated, the prenatally drug-exposed toddlers showed more subtle behavioral deficits within each domain. Although developmental quotients were within the average range, they were significantly lower than the preterm comparison group and did not adequately represent the more evident deficits seen through play in an unstructured situation. Unstructured assessments that required the child's initiation, goal setting, and follow-through were more revealing of developmental disorganization within and among domains than were adult structured assessments such as developmental tests. While modest differences were seen in structured tasks, the marked differences between the drug-exposed and preterm groups were most evident in the unstructured tasks. The lack of coherence across developmental domains was illustrated by the large difference between developmental quotient scores and the poor performance in the cognitive representional competencies demonstrated in play. Insecurity and disorganization in attachment were found to compromise further the development of the drug-exposed toddlers.

A prospective longitudinal research study of 86 prematurely born children from birth to age 18 years provided empirical evidence for continuity from infancy experience to representations of attachment at age 18 years. Young adults whose representation of attachment was dismissing had been objectively observed during infancy, 16-17 years earlier, to receive less sensitive maternal care than those infants who were later judged at early adulthood to have secure or preoccupied representations. Infancy experience alone did not differentiate young adults with secure representations from those with preoccupied representations. Rather, adverse life events through age 12, particularly parental divorce, reduced the likelihood of secure representations and increased the likelihood of preoccupied representations. The absence of adverse life events did not increase the likelihood of security for those who had not experienced early sensitive caregiving.

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