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Social touch alters newborn monkey behavior.

Elizabeth A Simpson1, Sarah E Maylott1, Roberto J Lazo1

  • 1Department of Psychology, University of Miami, Coral Gables, Florida, USA.

Infant Behavior & Development
|September 16, 2019
PubMed
Summary
This summary is machine-generated.

Newborn monkeys showed fewer stress behaviors and altered attention when touched by caregivers. Touch, regardless of type, reduced stress, while CT-targeted touch may prime attention, suggesting broad benefits for infant development.

Keywords:
CT fibersFace perceptionInfant behaviorNeonateSociabilitySocial attentionTactile

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Area of Science:

  • Primate developmental psychology
  • Neuroscience of social interaction
  • Infant sensory processing

Background:

  • Human infants respond positively to gentle touch processed by C-tactile (CT) fibers, showing reduced stress and increased social engagement.
  • Maternal touch influences social brain development and attention to faces in children.
  • Limited understanding exists regarding touch's effects on newborn psychological development and their ability to differentiate touch types.

Purpose of the Study:

  • To experimentally investigate the acute effects of caregiver touch on newborn monkeys, a model for human social development.
  • To determine if newborns can distinguish CT-targeted touch from non-CT touch.
  • To assess the impact of touch on newborns' social, emotional, and cognitive development.

Main Methods:

  • One-week-old rhesus macaque infants (N=27) experienced counter-balanced 5-minute caregiver interactions: CT-targeted stroking, non-CT stroking, or no touch, all with mutual gaze.
  • Remote eye tracking measured visual attention to social and nonsocial videos/pictures immediately following interactions.
  • Behavioral coding documented stress-related behaviors during interactions.

Main Results:

  • Infants exhibited fewer stress behaviors (self-scratching, locomotion) during both touch conditions compared to no-touch.
  • Following CT-targeted touch, infants showed faster orienting to picture arrays compared to other conditions.
  • Touch influenced visual attention, with infants in touch conditions attending equally to social and nonsocial videos, unlike the no-touch group.

Conclusions:

  • Newborn macaques respond positively to caregiver touch, showing reduced stress and altered attentional patterns.
  • Touch may broadly support psychological development in newborns, influencing emotional regulation and attention.
  • Findings suggest early evolutionary roots for the benefits of social touch shared across primates.