This study investigated attachment security and behavior in 34 physically disabled infants and 26 non-disabled infants by using convergent, categorical (secure, avoidant and ambivalent) and continuous (Attachment Behavior Q-Set) measures of the relationship, based on the same set of home observations. Proportions of attachment classifications were not different for disabled and non-disabled infants, but insecure infants in the disabled group scored consistently lower on the AQS security score than nondisabled insecure infants. This result suggests that while proportions of attachment classifications may not vary as a function of infant status, insecure disabled infants are more insecure than insecure non-disabled infants. An analysis of 5 behavioral dimensions of the AQS showed that secure infants emitted the same kinds of attachment behaviors without regard for infant status. Insecure disabled infants, however, showed lower levels of secure base behavior and physical contact with mother than their non-disabled counterparts, and showed a marginal tendency to fuss more as well. Discussion focuses on the potential benefits of using convergent, categorical and continuous measures of attachment in the study of both typical and atypical groups of infants.

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