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Motivation: cause or confound in information processing/intelligence correlations?

G E Larson1, D P Saccuzzo, J Brown

  • 1Navy Personnel Research and Development Center, Personnel Systems Department, San Diego, CA 92152.

Acta Psychologica
|February 1, 1994
PubMed
Summary
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Motivational differences do not explain the link between information processing speed and intelligence. Study findings suggest cognitive abilities, not motivation, drive this correlation.

Area of Science:

  • Cognitive Psychology
  • Psychometrics

Background:

  • Correlations between information processing and intelligence are well-established.
  • The role of motivational factors in this relationship remains debated.

Purpose of the Study:

  • To investigate whether motivational differences explain the observed correlations between information processing scores and intelligence.
  • To determine if incentives influence the relationship between cognitive test performance and IQ.

Main Methods:

  • 109 college students completed cognitive tests.
  • A subset of 100 students were retested under incentive or no-incentive conditions.
  • Physiological (heart rate, skin conductance) and self-report measures assessed effort.
  • Intelligence was measured using the Advanced Otis-Lennon Test of Mental Abilities and Raven Progressive Matrices.

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Main Results:

  • Incentives had minor effects on overall performance.
  • Incentives did not alter the correlation between information processing scores and intelligence.
  • Effort measures showed modest changes with incentives.

Conclusions:

  • The correlation between information processing and intelligence likely reflects shared underlying mental capacities.
  • Motivational variables do not appear to be the primary explanation for this relationship.
  • Findings support a cognitive basis for intelligence-performance correlations.