Developing Context-Appropriate Emotions: Longitudinal Changes in Emotion Reactivity and Emotion Regulation From 6 to...

Area of Science:

• Developmental psychology
• Infant emotional development
• Behavioral neuroscience

Background:

• Traditional theories suggest negative affect decreases with age due to improved emotion regulation.
• Infant research indicates a potential increase in negative affect during the first year of life.
• Understanding infant emotion dynamics is crucial for developmental trajectories.

Purpose of the Study:

• To investigate changes in infant emotion reactivity, regulation, and physiological arousal from 6 to 12 months.
• To analyze the temporal dynamics (intensity, variability, lability, persistence) of emotional responses.
• To examine the coherence between behavioral and physiological measures of emotion over time.

Main Methods:

• Emotion-eliciting task (toy retraction) with continuous, second-by-second measurement of observed emotion, regulation, and heart rate.
• Analysis of intensity, variability, lability, and persistence of negative reactivity and arousal.
• Cross-correlation analyses to assess temporal associations between reactivity, regulation, and heart rate.

Main Results:

• Negative reactivity intensity, variability, and lability increased from 6 to 12 months.
• Regulatory strategy use increased during stress (challenge) but decreased and stabilized post-stress (recovery).
• Behavioral and physiological responses showed stronger temporal associations at 12 months compared to 6 months, indicating increased coherence.

Conclusions:

• Infancy is characterized by increasing negative affect and reactivity, alongside developing regulatory strategies.
• Older infants demonstrate enhanced emotional flexibility, with more context-appropriate responses.
• Increased coherence between behavior and physiology suggests a maturing emotional system in infants.