Abstract
The relationship between psychometric intelligence (measured by Raven's Advanced Progressive Matrices) and two selective reaction time tasks was determined for 81 university students. These RT tasks allow the investigation of the process of stimulus discrimination and its correlation with intelligence, thus excluding response choice, which is sensitive to practice effects. In addition, shortcomings of previous studies using the Hick task (visual attention effects, response bias effects) can be avoided. Results for the RT-IQ relationship are generally in line with those for the Hick paradigm, but some surprising findings emerged: Movement times showed higher correlations with intelligence than RTs. An explanation for this results on the basis of a correlation between RT/MT strategies and IQ was tested and found to be adequate. The size of slope-IQ correlations was found to be dependent on the fit of the slope to Hick's law. The results are discussed with respect to the specific demands of selective RT tasks.
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