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Cognitive speed and subsequent intellectual development: a longitudinal investigation.

S J Witt, W R Cunningham

Journal of Gerontology

|July 1, 1979

Summary

Intellectual speed in early adulthood predicts later cognitive abilities. This longitudinal study found that cognitive speed at age 20 strongly predicted verbal and numerical skills in middle age.

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Area of Science:

Psychology
Cognitive Science
Gerontology

Background:

The relationship between cognitive processing speed and psychometric abilities is a key area of research in developmental psychology.
Previous studies have explored the link between cognitive speed and intellectual performance, particularly in younger adults.

Purpose of the Study:

To test the hypothesis that intellectual speed assessed in early adulthood predicts intellectual achievement later in life.
To examine the predictive power of cognitive speed on verbal and numerical abilities in middle age.

Main Methods:

A time-lagged cross-correlational analysis was employed using longitudinal data.
Data from 32 participants tested at age 19.5 years (1944) and again at age 46.7 years (1972) were analyzed.
The Relations Factor of the Army Alpha Examination, measuring speeded simple analogies and short-term memory, was used as the predictor variable.

Main Results:

The study found significant support for the hypothesis (p < .01).
Cognitive speed at age 20 was a strong predictor of both verbal and numerical abilities in middle age.
Findings underscore the cognitive and intellectual aspects of behavioral speed.

Conclusions:

Cognitive speed in early adulthood is a significant factor for later intellectual development.
The results support the intellectual speed hypothesis and highlight the utility of time-lag designs in longitudinal research.
These findings contribute to understanding the long-term implications of cognitive processing speed on intellectual abilities.

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