Infancy: Socioemotional Development

All 6 Terms & Definitions

Primary emotions

The earliest appearing emotions — distress, contentment, surprise, disgust — present from birth, followed by joy at 6–8 weeks, anger and sadness at 4–6 months, and fear at 6–8 months (indexed by stranger anxiety and the visual cliff response). These are considered universal and biologically rooted, with emergence tied to neural maturation rather than experience.

Emotional contagion

The automatic mimicry and synchronisation of facial expressions, vocalisation, posture, and movements with another person, producing emotional convergence. Observed in neonates within hours of birth (Meltzoff & Moore, 1977 — neonatal imitation of facial expressions). Emotional contagion is the most primitive form of social emotional resonance and a precursor to empathy.

Still-face paradigm

An experimental paradigm (Tronick et al., 1978) in which a caregiver interacts normally with the infant, then adopts a still, expressionless face. Infants as young as 2–3 months show a characteristic response: initial social bids (smiling, reaching) to re-engage the caregiver, then increasing distress when these fail, then gaze aversion and self-soothing withdrawal. The still-face effect demonstrates the mutual regulation model — infants and caregivers co-regulate emotional state in every interaction.

Joint attention

The triadic capacity to coordinate attention between a social partner and an external object or event. Includes gaze-following (following the caregiver's gaze to a target), pointing comprehension (understanding a point as a communication about a referent), and declarative pointing (using one's own point to share interest with another). Emerges at approximately 9–12 months. A consistent predictor of language development and a marker that is often delayed in autism spectrum disorder.

Social referencing

The infant's use of a caregiver's emotional expression as information to regulate their own response to ambiguous situations. Emerges at around 8–9 months. The visual cliff paradigm (Sorce et al., 1985) provides the classic demonstration: 74% of infants crossed the deep side of the visual cliff when their mother posed happiness; 0% crossed when she posed fear. Social referencing shapes fear learning, exploration, and object appraisal in the first year.

Attachment formation

The process by which an infant develops a preferential bond with one or more caregivers who provide a secure base for exploration and a safe haven in distress. Attachment behaviours (proximity-seeking, clinging, crying at separation, greeting at reunion) become organised and directed toward specific figures at approximately 6–9 months. Quality of attachment is classified using the Strange Situation (Ainsworth): secure, anxious-avoidant, anxious-ambivalent, or disorganised.