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Effects of different types of contingent tactile stimulation on crying, smiling, and sleep in newborns: an

Marco Cecchini1, Eleonora Baroni, Cinzia Di Vito

  • 1Department of Dynamic and Clinical Psychology, Sapienza University of Rome, Via degli Apuli 1, 00185 Rome, Italy.

Developmental Psychobiology
|June 8, 2012
PubMed

Insights

Continuous tactile stimulation in newborns reduces crying and active sleep (AS), while increasing smiling and quiet sleep. This suggests environmental touch influences infant sleep-wake organization and emotional processing.

Area of Science:

  • Neonatal development
  • Infant sleep
  • Behavioral neuroscience

Background:

  • Infant sleep-wake cycles and environmental interaction undergo significant changes in the first year.
  • Limited research exists on how environmental stimulation impacts infant sleep organization.
  • Tactile stimulation is a key sensory input for newborns.

Purpose of the Study:

  • To investigate the influence of continuous and discontinuous tactile stimulation on newborn crying, smiling, and sleep-wake states.
  • To test the hypothesis that greater continuity of tactile stimulation decreases crying and active sleep (AS), and increases smiling and quiet sleep.
  • To explore the relationship between behavioral states during wakefulness and subsequent sleep patterns.

Main Methods:

  • 82 newborns (15-30 hours old) were assessed, with 40 meeting inclusion criteria.
  • Newborns were randomly assigned to four groups: continuous stimulation (CS), discontinuous nonperiodic (DnPS), discontinuous periodic (DPS), and absent stimulation (AbS).
  • Behavioral states (crying, smiling) and sleep organization (AS, quiet sleep, grouped REM) were monitored post-stimulation.

Main Results:

  • The CS group exhibited more smiling and less crying compared to the DnPS group during stimulated wakefulness.
  • Continuous stimulation led to longer wake periods before sleep and altered active sleep (AS) patterns, specifically reducing grouped REM (GREM).
  • GREM during AS was negatively correlated with prior smiling and positively with prior crying, suggesting a role in affective state processing.

Conclusions:

  • Varying levels of continuous tactile stimulation post-birth can influence infant crying, smiling, and sleep organization.
  • Active sleep may play a crucial role in processing affective states in newborns.
  • Contingent tactile stimulation appears to be a significant factor in organizing early behavioral states and sleep patterns.

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