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Brain, environment, heredity, and personality

D D Smith1

  • 1Bishop's University, Lennoxville, Qué, Canada.

Psychological Reports
|February 1, 1993
PubMed
Summary
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Behavior genetics research identifies two environmental influences on personality and intellect. The unique environment

Area of Science:

  • Behavioral genetics
  • Developmental psychology
  • Neuroscience

Background:

  • Behavior genetics research typically models personality and intellectual development based on heredity and environment.
  • Two types of environmental influences are consistently identified: shared (between-family) and nonshared (within-family/unique).
  • The shared environment is conceptually straightforward, but the origin of the nonshared environment remains undetermined.

Purpose of the Study:

  • To propose a novel source for the unexplained variance attributed to the nonshared environment in behavior genetics.
  • To investigate the role of inherent brain dynamics in individual developmental variability.

Main Methods:

  • This study presents a theoretical argument, synthesizing existing findings in behavior genetics.

Related Experiment Videos

  • It draws upon concepts from dynamic systems theory and neuroscience.
  • No new empirical data were collected; the focus is on conceptual integration.

    • Main Results:

    • The nonshared environment accounts for a significant portion of variance in personality and intellect.
    • Its unique nature to each individual presents a conceptual challenge.
    • The study posits the brain's inherent indeterminacy as the source of this variability.

    Conclusions:

    • The brain, as a dynamic and indeterminate system, is proposed as the origin of the unresolved developmental variability observed in behavior genetics.
    • This perspective offers a potential resolution to the mystery of the nonshared environment's source.
    • Understanding brain dynamics is crucial for a complete model of personality and intellectual development.