Reactive attachment disorder
The broad theoretical framework for current versions of RAD is attachment theory, based on work conducted from the 1940s to the 1980s by John Bowlby, Mary Ainsworth and René Spitz. Attachment theory is a framework that employs psychological, ethological and evolutionary concepts to explain social behaviors typical of young children. 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 individual's feelings, thoughts, and expectations in later relationships. For a diagnosis of reactive attachment disorder, the child's history and atypical social behavior must suggest the absence of formation of a discriminatory or selective attachment.
Dyadic developmental psychotherapy
Similarities to certain attachment therapy practices have also provoked controversy. It has been suggested that the therapy appears to use age regression and holding techniques—features of attachment therapy not congruent with attachment theory. Becker-Weidman cites Daniel Hughes's 1997 book "Facilitating Developmental Attachment", which contains sections on the use of age regression and holding therapy, as a source document for dyadic developmental psychotherapy. The advocacy group Advocates for Children in Therapy include dyadic developmental psychotherapy in their list of "attachment therapies by another name", and continue to list Hughes as a proponent of attachment therapy, citing statements of his that appear to endorse holding therapy. In particular, they cite material from Hughes's website about the use of physical contact in therapy as follows: