An Inuit family is sitting on a log outside their tent. The parents, wearing warm clothing made of animal skins, are engaged in domestic tasks. Between them sits a toddler, also in skin clothes, staring at the camera. On the mother's back is a baby in a papoose.

Attachment theory is a psychological, evolutionary and ethological theory concerning relationships between humans. The most important tenet of attachment theory is that a young child needs to develop a relationship with at least one primary caregiver for social and emotional development to occur normally. The theory was formulated by psychiatrist and psychoanalyst John Bowlby.

Within attachment theory, infant behaviour associated with attachment is primarily the seeking of proximity to an attachment figure in stressful situations. Infants become attached to adults who are sensitive and responsive in social interactions with them, and who remain as consistent caregivers for some months during the period from about six months to two years of age. During the latter part of this period, children begin to use attachment figures (familiar people) as a secure base to explore from and return to. Parental responses lead to the development of patterns of attachment; these, in turn, lead to internal working models which will guide the individual's feelings, thoughts and expectations in later relationships. Separation anxiety or grief following the loss of an attachment figure is considered to be a normal and adaptive response for an attached infant. These behaviours may have evolved because they increase the probability of survival of the child.

Research by developmental psychologist Mary Ainsworth in the 1960s and 70s underpinned the basic concepts, introduced the concept of the "secure base" and developed a theory of a number of attachment patterns in infants: secure attachment, avoidant attachment and anxious attachment. A fourth pattern, disorganised attachment, was identified later. In the 1980s, the theory was extended to attachments in adults. Other interactions may be construed as including components of attachment behaviour; these include peer relationships at all ages, romantic and sexual attraction and responses to the care needs of infants or the sick and elderly.

To formulate a comprehensive theory of the nature of early attachments, Bowlby explored a range of fields, including evolutionary biology, object relations theory (a tenet of psychoanalysis), control systems theory, and the fields of ethology and cognitive psychology. After preliminary papers from 1958 onwards, Bowlby published the full theory in the trilogy Attachment and Loss (1969–82). In the early days of the theory, academic psychologists criticized Bowlby, and the psychoanalytic community ostracised him for his departure from psychoanalytical tenets; however, attachment theory has since become the dominant approach to understanding early social development, and has given rise to a great surge of empirical research into the formation of children's close relationships. Later criticism of attachment theory has come from a variety of disciplines. Attachment theory has been significantly modified as a result of empirical research, but the concepts have become generally accepted. Attachment theory has formed the basis of new therapies and informed existing ones, and its concepts have been used in the formulation of social and childcare policies to support the early attachment relationships of children.

Attachment

A young mother smiles up at the camera. On her back is her baby gazing at the camera with an expression of lively interest.

Within attachment theory, attachment means an affectional bond or tie between an individual and an attachment figure (usually a caregiver). Such bonds may be reciprocal between two adults, but between a child and a caregiver these bonds are based on the child's need for safety, security and protection, paramount in infancy and childhood. The theory proposes that children attach to carers instinctively, for the purpose of survival and, ultimately, genetic replication. The biological function is survival and the psychological function is security. Attachment theory is not an exhaustive description of human relationships, nor is it synonymous with love and affection, although these may indicate that bonds exist. In child-to-adult relationships, the child's tie is called the "attachment" and the caregiver's reciprocal equivalent is referred to as the "care-giving bond".

Infants will form attachments to any consistent caregiver who is sensitive and responsive in social interactions with them. The quality of the social engagement is more influential than the amount of time spent. The biological mother is the usual principal attachment figure, but the role can be taken by anyone who consistently behaves in a "mothering" way over a period of time. Within attachment theory, this means a set of behaviours that involves engaging in lively social interaction with the infant and responding readily to signals and approaches. Nothing in the theory suggests that fathers are not equally likely to become principal attachment figures if they happen to provide most of the child care and related social interaction.

Some infants direct attachment behaviour (proximity seeking) towards more than one attachment figure almost as soon as they start to show discrimination between caregivers; most come to do so during their second year. These figures are arranged in hierarchical order, with the "principal attachment figure" at the top. The set-goal of the attachment behavioural system is to maintain a bond with an accessible and available attachment figure. If the figure is unavailable or unresponsive, separation distress occurs. The anticipation of such an occurrence arouses separation anxiety. Bowlby distinguished between alarm and anxiety: "alarm" was the term for activation of the attachment behavioural system caused by fear of danger, while "anxiety" was the fear of being cut off from the attachment figure. In infants, physical separation can cause anxiety and anger, followed by sadness and despair.

By age three or four, physical separation is no longer such a threat to the child's bond with the attachment figure. Threats to security in older children and adults arise from prolonged absence, breakdowns in communication, emotional unavailability or signs of rejection or abandonment.

Attachment behaviours

The attachment behavioural system serves to maintain or achieve closer proximity to the attachment figure.

A baby sits a rug on the floor surrounded by toys. He stares down at a cloth book in his hands in a posture of interest and concentration.

Pre-attachment behaviours occur in the first six months. During the first phase (the first eight weeks), infants smile, babble and cry to attract the attention of caregivers. Although babies are learning to discriminate between caregivers, these behaviours are directed at anyone in the vicinity. During the second phase (two to six months), the infant increasingly discriminates between familiar and unfamiliar adults, becoming more responsive towards the caregiver; following and clinging is added to its repertoire. Clear-cut attachment develops in the third phase, between the ages of six months and two years. The infant's behaviour towards the caregiver becomes organised on a goal-directed basis to achieve the conditions that make it feel secure. By the end of the first year the infant is able to display a range of attachment behaviours designed to maintain proximity. These manifest as protesting the caregiver's departure, greeting the caregiver's return, clinging when frightened and following when able. With the development of locomotion, the infant begins to use the caregiver or caregivers as a safe base from which to explore. Infant exploration is greater when the caregiver is present because the infant's attachment system is relaxed and it is free to explore. If the caregiver is inaccessible or unresponsive, attachment behaviour is strongly activated. Anxiety, fear, illness and fatigue will cause a child to increase attachment behaviours. Many attachment behaviours occur only in threatening or uncomfortable circumstances, such as the approach of an unfamiliar person (stranger wariness), and it may be impossible to measure the presence of attachment without creating such circumstances.

After the second year, as the child begins to see the carer as an independent person, a more complex and goal-corrected partnership is formed. Whereas babies will cry because of pain, two-year-olds will cry to summon their caregiver, and if that does not work, cry louder or shout or follow. Children also begin to notice others' goals and feelings, planning their actions accordingly.

Tenets

Common human attachment behaviours and emotions are adaptive. Human evolution has involved selection for social behaviours that make individual or group survival more likely. The commonly observed attachment behaviour of toddlers staying near familiar people would have had safety advantages in the environment of early adaptation, and has such advantages today. Bowlby saw the environment of early adaptation as similar to current hunter-gatherer societies.

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