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Measuring Cardiac Autonomic Nervous System (ANS) Activity in Toddlers - Resting and Developmental Challenges
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Touch attenuates infants' physiological reactivity to stress
Ruth Feldman1, Magi Singer, Orna Zagoory
1Department of Psychology and the Gonda Brain Sciences Center, Bar-Ilan University, Israel. feldman@mail.biu.ac.il
Developmental Science
|February 9, 2010
Summary
Maternal touch significantly reduces infant stress reactivity during simulated maternal separation. This tactile contact helps regulate infant cortisol levels and cardiac vagal tone, promoting resilience.
Area of Science:
- Developmental psychology
- Neuroscience
- Human infant behavior
Background:
- Maternal contact is known to regulate infant stress responses in animal models.
- Simulated maternal deprivation can induce physiological stress in human infants.
Purpose of the Study:
- To investigate the impact of maternal touch on infant stress reactivity during a simulated maternal deprivation paradigm.
- To assess the physiological effects of touch on infant cortisol and cardiac vagal tone.
Main Methods:
- Fifty-three mother-infant dyads participated in two conditions: still-face (SF) and still-face with maternal touch (SF+T).
- Cortisol levels and cardiac vagal tone were measured at baseline, reactivity, and recovery phases.
- Behavioral observations of touch synchrony and asynchrony were recorded.
Main Results:
- Infants in the SF condition exhibited higher cortisol reactivity compared to the SF+T condition.
- Cortisol levels decreased during recovery in the SF+T group, but increased in the SF group.
- Cardiac vagal tone suppression was greater in the SF condition without touch.
- Touch synchrony correlated with higher infant vagal tone, while asynchrony correlated with elevated maternal and infant cortisol.
Conclusions:
- Maternal touch plays a crucial role in mitigating infant physiological stress responses during periods of maternal unavailability.
- Tactile contact during stressful situations can buffer negative effects on infant stress hormones and autonomic nervous system regulation.
- Synchronized maternal touch supports infant emotional regulation, whereas asynchronous touch may exacerbate stress for both mother and infant.
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