III. THE ORGANIZATION OF ATTACHMENT BEHAVIOR IN EARLY CHILDHOOD: LINKS WITH MATERNAL SENSITIVITY AND CHILD ATTACHMENT REPRESENTATIONS.

This article investigated two central questions about mother-child attachment relationships during early childhood: (1) the association between maternal sensitivity and child attachment behavior (Study 1) and (2) the link between child attachment behavior and representations (Study 2). In Study 1, maternal sensitivity and child security were assessed in naturalistic contexts among 74 middle-class dyads, when children were about 3.5 and again 5.5 years of age, using the Maternal Behavior with Preschoolers Q-set (MBPQS) and the Attachment Q-set (AQS), respectively. Sensitivity and security were significantly related at each point in time and stable from 3.5 to 5.5 years of age. Furthermore, changes in sensitivity predicted changes in child security. In Study 2, the relationship between the organization of preschoolers' attachment behavior and the structure of attachment representations (secure base script knowledge) was assessed. Participants were 158 preschoolers between 3 and 5.5 years. Children's secure base behavior was described with the AQS, whereas their attachment script knowledge was assessed with the MacArthur Attachment Story Completion Task. The organization of children's secure base behavior was significantly, if modestly, associated with their knowledge of the secure base script.

V. MATERNAL SENSITIVITY AND CO-CONSTRUCTION SKILLS: CONCURRENT AND LONGITUDINAL ASSOCIATIONS WITH PRESCHOOLERS' SECURE BASE BEHAVIOR.

This study investigated the associations among maternal sensitivity, maternal secure base script co-construction skills, and children's secure base behavior during early childhood. Maternal sensitivity and children's secure base behavior were assessed in naturalistic settings among 81 mother-child dyads when the children were approximately 3.5 years old. Maternal co-construction skills were also assessed at that age via a joint mother-child storytelling task. Maternal sensitivity and secure base behavior were assessed again when children (N = 74) were about 5.5 years old. Results indicated that mother sensitivity assessed at the early age was significantly related to maternal co-construction skills. Maternal co-constructive skills in turn were also significantly associated with children's secure base behavior both concurrently and longitudinally. Finally, regression analyses indicated both maternal sensitivity, concurrently at each point in time, and co-construction skills contributed unique and significant information to the prediction of child secure base behavior.

II. MEASURES: SECURE BASE BEHAVIOR, CO-CONSTRUCTION, AND ATTACHMENT SCRIPTS.

In order to examine the interplay between behavioral and cognitive representations of attachment during early childhood, we compiled both behavior-based and more cognitive-based attachment measures for this age range. The behavior-based measures were observational Q-set methodologies already established in the literature. Measures of attachment representations for the children and mothers were narrative-based procedures, that is, established storytelling tasks for obtaining attachment narratives from children and adults. For assessing maternal co-construction processes, we developed two new co-construction tasks that required joint storytelling of attachment relevant storylines in one case, and joint conversations about emotion-laden situations in the other. All of these measures are based on the central secure base construct of attachment theory. Behavioral measures assess secure base use and support. Attachment narratives collected from both children and parents are scored for secure base script knowledge. Maternal co-construction is assessed in terms of cognitive processes that enhance and promote attachment script knowledge.

VIII. CONCLUSION: CO-CONSTRUCTING A SECURE BASE PARTNERSHIP: MOTHER-CHILD INTERACTIONS, COMMUNICATION, AND SCRIPT REPRESENTATIONS.

Using the secure base construct, the evidence presented indicates that interactional experience continues to be a central factor in the organization of mother-child attachment relationships. The parent-child codetermination process that establishes their relationship in infancy expands during the preschool years. Furthermore, with the increasingly relevant role of language, parent-child verbal communication during this time plays an important part in structuring children's attachment behavior and knowledge. Parents help their children construe attachment-related information, control and regulate emotional experience, and guide behavior during attachment-related experiences. That is, during early childhood, parent and child continue the process of constructing a secure base partnership through their gradually more complex interactions that take advantage of children's behavioral, emotional, representational, and language advances. Although the studies are interrelated and contribute to a coherent understanding of attachment relationships during this time period, they represent small-scale studies. Further, some of the effect sizes presented are small. Thus, future research should include tests of replication as well as explorations of links to early and later development and parallel findings in more diverse samples.

I. INTRODUCTION: THE CO-CONSTRUCTION OF MOTHER-CHILD ATTACHMENT RELATIONSHIPS IN EARLY CHILDHOOD.

Attachment relationships are formed, organized, and elaborated through interactions between an attachment figure and her/his child. The parent-child codetermination process that establishes their relationship in infancy extends and expands during the preschool years. A child's developing ability to use her/his mother as a secure base requires support, time, and practice during early childhood. Moreover, experiences with attachment figures provide information that children use to build internal representations of their relationship. Thus, the organization of attachment behavior is expected to be related to the structure of a child's attachment representations. Yet, questions about how the structure of those representations develop remain unanswered. In moving into the preschool years, we anticipate that building of mental representations of secure base support and use will be guided by parent-child co-construction processes. The child's improving language and advancing information processing skills increase the opportunities for verbally based interactions between caregiver and child. The mother-child co-construction process of secure base relationships includes now a verbal-representational component, but the nonverbal, behavioral building blocks remain in play as well.