Abstract
Although the correlation between general cognitive ability (g) and performance on speeded cognitive tasks is well-established, there is need for a better understanding of how successive stages of processing contribute to this relationship. Previous research suggests that g is primarily associated with the rapidity of decision-making rather than perceptual processing of stimuli; the implication is that g should statistically interact with a manipulation affecting the difficulty of the decision process, while simultaneously failing to interact with a perceptual manipulation. We applied Sternberg’s method of additive factors to test this hypothesis in two reaction time tasks, each of which systematically manipulated the demands on perceptual acuity and decision-making. With a total of 773 participants, we found evidence of an interaction between a short-form measure of g and the decisional—but not perceptual—manipulations. This pattern was found in both number-comparison (Experiment 1) and tone-comparison (Experiment 2) tasks. Additionally, diffusion modeling of the Experiment 1 results revealed that the diffusion rate (v) is associated with g and affected by an informational attribute of the stimulus (numerical magnitude) but not a perceptual attribute (contrast); the nondecision time (Ter) is not associated with g and shows the opposite pattern of selective influence. Taken together, these findings add to the evidence for a theoretical framework partitioning reaction time into several processing stages, of which only the decisionmaking stage is associated with g.
Original language | English (US) |
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Pages (from-to) | 1792-1809 |
Number of pages | 18 |
Journal | Journal of Experimental Psychology: Learning Memory and Cognition |
Volume | 47 |
Issue number | 11 |
DOIs | |
State | Published - 2021 |
Bibliographical note
Funding Information:This project was funded by a University of Minnesota OVPR Grant-in- Aid of Research, Artistry and Scholarship (GIA). Raw data and R code used in key analyses are available on the Open Science Framework (OSF; osf.io/mxfuw). The authors have no competing interests to declare.
Publisher Copyright:
© 2021 American Psychological Association
Keywords
- Cognitive ability
- Diffusion modeling
- G
- Intelligence
- Reaction time