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Security is the quality of being safe or free of danger. In psychological terms, this may be considered in terms of attachment or bonding—the prime example of which is between parent and child. Securely attached children show appropriate distress when their caregivers leave yet are able to compose themselves and respond positively to the caregivers’ return. Secure children feel that their caregivers dependably protect them. Conversely, insecurely attached children may be excessively distressed when their caregivers are absent, may avoid their caregivers when present, or show chaotic patterns of interaction with caregivers. Mother–child attachment depends on sensitive caregiving thoughts and behaviors, governed by neural processes that adapt to the early postpartum period and shift developmentally. For infants, maternal sensitivity critically shapes infants’ concurrent and future sense of security and behaviors when confronted with separation or absence of the caregiver in the face of stress. Across the life span, the same brain circuits operate to regulate thoughts and behaviors to cope with stress. This entry examines the origins of security, neurohormonal mechanisms underlying it, and psychopathological outcomes and discusses future directions for research.

Origins

After the mother gives birth, her brain undergoes dynamic changes to support the establishment and maintenance of caregiving behaviors that can sustain infants through an extensive dependency period. New mothers may be preoccupied with real and imagined danger to their infant and engage in a range of protective, sensitive behaviors. Thus, the mother–infant relationship and maternal sensitivity programs infants with their first interpersonal social experiences, forming templates for what they can expect from others throughout life and how to respond in ways that seek, maintain, and restore security. The extent to which mothers and fathers can foster a secure environment dictates the extent to which their offspring will be able maintain their own security, shape the security of future relationships, and across subsequent generations.

Indeed, the mother–infant relationship critically depends on thoughts and behaviors that are common across mammalian species and include reciprocal auditory and tactile communication, nursing or feeding, and the preparation of a safe home and environment. Since about the year 2000, researchers, building from a rich literature of animal studies of mothers, have performed coordinated biobehavioral studies of human parenting. For example, poignant and even personalized baby stimuli, such as pictures and cries, are presented to parents while brain activity is measured. Results are correlated with parenting behaviors, and parenting cognitions are assessed, for example, by interview or videotape assessment. Thus, there is an evolving neuroscience of security—from development in infancy based on parental brain function to mechanisms that shape mental health risk and resilience throughout life in the allied social neuroscience literature.

Neural Underpinnings

Neurocircuits involved in human parental caregiving behaviors include deep and evolutionarily ancient brain structures that assess salience of stimuli, respond to stress, and motivate behavior. These include the hypothalamus, midbrain, thalamus, amygdala, dorsal striatum, and ventral striatum. Higher order cortical structures now being studied with human neuroimaging include the anterior cingulate cortex, ventromedial prefrontal cortex, insula, and orbitofrontal cortex. These neurocircuits adaptively change throughout development as the result of experience. They overlap with the same reward neurocircuits in the dopaminergic mesolimbic pathway that are associated with the pleasure of secure feelings, including the ventral tegmental area, nucleus accumbens, amygdala, and hippocampus for reward signaling and also in the dopaminergic mesocortical pathway. Brain cortex areas, including anterior cingulate cortex, ventromedial prefrontal cortex, and orbitofrontal cortex, are involved in higher order reward representation, cognitive control, and emotion regulation. Thus, across animal and human research, parents utilize these neurocircuits to motivate and regulate parental sensitivity toward building social security.

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