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Inhibited Infants More Likely to Become Introverted Adults

A new study over more than two decades reveals that infants with greater behavioral inhibition are more likely to be reserved and introverted at age 26.

Behavioral inhibition (BI) is characterized by cautious, fearful, and avoidant behavior toward unfamiliar people, objects, and situations. BI has been found to be relatively stable across toddlerhood and childhood, and children with BI have been found to be at greater risk for developing social withdrawal and anxiety disorders than those without BI.

The findings are published in the journal Proceedings of the National Academy of Sciences.

“While many studies link early childhood behavior to risk for psychopathology, the findings in our study are unique,” said Daniel Pine, M.D., a study author and chief of the NIMH Section on Development and Affective Neuroscience. “This is because our study assessed temperament very early in life, linking it with outcomes occurring more than 20 years later through individual differences in neural processes.”

Temperament refers to biologically-based individual differences in the way people emotionally and behaviorally respond to the world. During infancy, temperament serves as the foundation of later personality.

Although these findings hint at the long-term outcomes of inhibited childhood temperament, only two studies to date have followed inhibited children from early childhood to adulthood.

The current study, conducted by researchers at the University of Maryland, College Park, the Catholic University of America, Washington, D.C., and the National Institute of Mental Health, observed their participant sample at 4 months of age and characterized them for BI at 14 months.

At age 15, the participants returned to the lab to provide neurophysiological data. These neurophysiological measures were used to assess error-related negativity (ERN), which reflects the degree to which people are sensitive to errors.

ERN shows as a negative dip in the brain’s electrical signal following incorrect responses on computerized tasks. A larger error-related negativity signal has been associated with internalizing conditions such as anxiety, and a smaller error-related negativity has been associated with externalizing conditions such as impulsivity and substance use.

The participants returned at age 26 for assessments of psychopathology, personality, social functioning, and education and employment outcomes.

“It is amazing that we have been able to keep in touch with this group of people over so many years. First their parents, and now they, continue to be interested and involved in the work,” said study author Nathan Fox, Ph.D., of the University of Maryland Department of Human Development and Quantitative Methodology.

Overall, the researchers found that BI at 14 months of age predicted, at age 26, a more reserved personality, fewer romantic relationships in the past 10 years, and lower social functioning with friends and family.

BI at 14 months also predicted higher levels of internalizing psychopathology in adulthood, but only among those who also displayed larger error-related negativity signals at age 15. BI was not associated with externalizing general psychopathology or with education and employment outcomes.

This study highlights the enduring nature of early temperament on adult outcomes and suggests that neurophysiological markers such as error-related negativity may help identify individuals most at risk for developing internalizing psychopathology in adulthood.

“We have studied the biology of behavioral inhibition over time and it is clear that it has a profound effect influencing developmental outcome,” said Fox.

Source: NIH/ National Institute of Mental Health

Inhibited Infants More Likely to Become Introverted Adults

Traci Pedersen

Traci Pedersen is a professional writer with over a decade of experience. Her work consists of writing for both print and online publishers in a variety of genres including science chapter books, college and career articles, and elementary school curriculum.

APA Reference
Pedersen, T. (2020). Inhibited Infants More Likely to Become Introverted Adults. Psych Central. Retrieved on August 3, 2020, from https://psychcentral.com/news/2020/04/22/inhibited-infants-more-likely-to-become-introverted-adults/155900.html
Scientifically Reviewed
Last updated: 22 Apr 2020 (Originally: 22 Apr 2020)
Last reviewed: By a member of our scientific advisory board on 22 Apr 2020
Published on Psych Central.com. All rights reserved.