Attachment theory focuses on the tendency of infants or children to seek proximity to a particular attachment figure (familiar caregiver), in situations of alarm or distress, behavior which appears to have survival value. This is known as a discriminatory or selective attachment. Subsequently, the child begins to use the caregiver as a base of security from which to explore the environment, returning periodically to the familiar person. Attachment is not the same as love and/or affection although they are often associated. Attachment and attachment behaviors tend to develop between the ages of six months and three years. Infants become attached to adults who are sensitive and responsive in social interactions with the infant, and who remain as consistent caregivers for some time. Caregiver responses lead to the development of patterns of attachment, that in turn lead to internal working models which will guide the individuals feelings, thoughts, and expectations in later relationships. For a diagnosis of reactive attachment disorder, the childs history and atypical social behavior must suggest the absence of formation of a discriminatory or selective attachment. The pathological absence of a discriminatory or selective attachment needs to be differentiated from the existence of attachments with either typical or somewhat atypical behavior patterns, known as styles or patterns. There are four attachment styles ascertained and used within developmental attachment research. These are known as secure, anxious-ambivalent, anxious-avoidant, (all organized) and disorganized. The latter three are characterised as insecure.
In the US, initial evaluations may be conducted by psychologists, psychiatrists, Licensed Marriage and Family Therapists, Licensed Professional Counselors, specialist Licensed Clinical Social Workers or psychiatric nurses.In the UK, the British Association for Adoption and Fostering (BAAF) advise that only a psychiatrist can diagnose an attachment disorder and that any assessment must include a comprehensive evaluation of the childs individual and family history.According to the AACAP Practice Parameter (2005) the question of whether attachment disorders can reliably be diagnosed in older children and adults has not been resolved. Attachment behaviors used for the diagnosis of RAD change markedly with development and defining analogous behaviors in older children is difficult. There are no substantially validated measures of attachment in middle childhood or early adolescence. Assessments of RAD past school age may not be possible at all as by this time children have developed along individual lines to such an extent that early attachment experiences are only one factor among many that determine emotion and behavior. Criteria
ICD-10 describes reactive attachment disorder of childhood, known as RAD, and disinhibited attachment disorder, less well known as DAD. DSM-IV-TR also describes reactive attachment disorder of infancy or early childhood divided into two subtypes, inhibited type and disinhibited type, both known as RAD.