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Related Experiment Videos

Stress reactivity and self-recognition

M Lewis1, D S Ramsay

  • 1Department of Pediatrics, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, New Brunswick 08903-0019, USA. lewis@umdnj.edu

Child Development
|August 1, 1997
PubMed
Summary
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Early stress reactivity influences self-recognition development. Infants with higher cortisol responses and slower quieting after age 6 months showed earlier self-recognition, suggesting temperament plays a key role.

Area of Science:

  • Developmental psychology
  • Neuroscience
  • Behavioral science

Background:

  • Individual differences in stress reactivity emerge early in infancy.
  • Adrenocortical functioning undergoes a developmental shift around 6 months of age.
  • Stable individual differences in cortisol response become apparent by 6 months.

Purpose of the Study:

  • To investigate the longitudinal relationship between early stress reactivity and self-recognition at 18 months.
  • To determine if adrenocortical and behavioral stress responses in infancy predict later self-recognition.
  • To explore the role of temperament in the development of self-recognition.

Main Methods:

  • Longitudinal study design tracking infants from 2 to 18 months.
  • Measurement of adrenocortical (cortisol) and behavioral (quieting) stress responses to inoculation.

Related Experiment Videos

  • Assessment of self-recognition at 18 months of age.

    • Main Results:

    • Infants showing greater cortisol response and less rapid quieting at 6-18 months were more likely to exhibit self-recognition.
    • Stress responses at 2-4 months did not differentiate self-recognizers from non-self-recognizers.
    • Stable individual differences in cortisol response by 6 months were linked to later self-recognition.

    Conclusions:

    • Temperament, specifically stress reactivity, plays a significant role in facilitating the emergence of self-recognition.
    • The developmental shift in adrenocortical functioning around 6 months is critical for this association.
    • Early individual differences in stress response may provide a foundation for later cognitive developments like self-recognition.