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A new method for representing mental growth.

R S Wilson1

  • 1Department of Pediatrics, University of Louisville, Kentucky.

Acta Geneticae Medicae Et Gemellologiae
|January 1, 1987
PubMed
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This summary is machine-generated.

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This study introduces a novel method for mapping mental development from birth to adolescence. It reveals rapid early growth, slowing significantly by adulthood, impacting cognitive test correlations.

Area of Science:

  • Developmental Psychology
  • Behavioral Genetics
  • Psychometrics

Background:

  • Understanding mental development trajectories is crucial for identifying developmental milestones and individual differences.
  • Previous methods often lacked a standardized approach to quantify growth across different age ranges.

Purpose of the Study:

  • To develop and validate a new method for plotting mental development from birth through adolescence.
  • To characterize the rate and pattern of mental growth using longitudinal twin data.

Main Methods:

  • Constructed a dimension of mental growth by ordering tests by difficulty.
  • Calculated age-to-age gains in standard-deviation units from longitudinal twin data.
  • Generated cumulative mental growth curves for individuals and the sample.

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Main Results:

  • Observed rapid mental growth in the first 24 months (nearly 20 SDs).
  • Growth rate progressively decreased, with only 0.5 SD gain between 15 years and adulthood.
  • Terminal mental growth averaged 31 SD units, with individual differences of +/- 3 SD units.

Conclusions:

  • The developed method effectively visualizes mental growth trajectories.
  • Early infancy shows high gain relative to base level, explaining low infant cognitive test correlations.
  • Later childhood and adolescence show smaller gains, correlating with higher cognitive test scores.