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Cardiac function and behavioral reactivity during infancy

N Snidman1, J Kagan, L Riordan

  • 1Department of Psychology, Harvard University, Cambridge, MA 02138, USA.

Psychophysiology
|May 1, 1995
PubMed
Summary
This summary is machine-generated.

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Early cardiac function, including heart period and power, predicts infant temperament. These cardiac measures early in life may indicate temperamental qualities like reactivity and fear.

Area of Science:

  • Developmental psychology
  • Pediatric cardiology
  • Infant behavior

Background:

  • Cardiac function undergoes significant changes from the fetal period through infancy.
  • Individual differences in cardiac measures stabilize later in infancy.

Purpose of the Study:

  • To examine changes and stability in cardiac function from the fetal period to 21 months of age.
  • To investigate the relationship between early cardiac function and temperamental characteristics (reactivity, fear) in infancy.

Main Methods:

  • Longitudinal analysis of cardiac data (heart period, spectral power) from fetal stage to 21 months.
  • Assessment of infant temperament (high/low reactivity at 4 months, fear of the unfamiliar in the second year).

Main Results:

Related Experiment Videos

  • Heart period and cardiac power spectra changed significantly during the first two years of life.
  • Individual cardiac differences were not stable until 9-14 months of age.
  • Early cardiac measures (2-week sleep heart period, 2-month low-frequency power) predicted temperamental categories more effectively than later measures.

Conclusions:

  • Cardiac function early in life is a sensitive indicator of temperamental qualities.
  • Infant cardiac patterns may reflect underlying temperamental predispositions.