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A test of the diffusion model explanation for the worst performance rule using preregistration and blinding

Dutilh, Gilles and Vandekerckhove, Joachim and Ly, Alexander and Matzke, Dora and Pedroni, Andreas and Frey, Renato and Rieskamp, Jörg and Wagenmakers, Eric-Jan. (2017) A test of the diffusion model explanation for the worst performance rule using preregistration and blinding. Attention Perception & Psychophysics, 79 (3). pp. 713-725.

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Abstract

People with higher IQ scores also tend to perform better on elementary cognitive-perceptual tasks, such as deciding quickly whether an arrow points to the left or the right Jensen (2006). The worst performance rule (WPR) finesses this relation by stating that the association between IQ and elementary-task performance is most pronounced when this performance is summarized by people's slowest responses. Previous research has shown that the WPR can be accounted for in the Ratcliff diffusion model by assuming that the same ability parameter-drift rate-mediates performance in both elementary tasks and higher-level cognitive tasks. Here we aim to test four qualitative predictions concerning the WPR and its diffusion model explanation in terms of drift rate. In the first stage, the diffusion model was fit to data from 916 participants completing a perceptual two-choice task; crucially, the fitting happened after randomly shuffling the key variable, i.e., each participant's score on a working memory capacity test. In the second stage, after all modeling decisions were made, the key variable was unshuffled and the adequacy of the predictions was evaluated by means of confirmatory Bayesian hypothesis tests. By temporarily withholding the mapping of the key predictor, we retain flexibility for proper modeling of the data (e.g., outlier exclusion) while preventing biases from unduly influencing the results. Our results provide evidence against the WPR and suggest that it may be less robust and less ubiquitous than is commonly believed.
Faculties and Departments:07 Faculty of Psychology
07 Faculty of Psychology > Departement Psychologie
07 Faculty of Psychology > Departement Psychologie > Forschungsbereich Sozial-, Wirtschafts- und Entscheidungspsychologie > Cognitive and Decision Sciences (Mata)
07 Faculty of Psychology > Departement Psychologie > Forschungsbereich Sozial-, Wirtschafts- und Entscheidungspsychologie > Economic Psychology (Rieskamp)
UniBasel Contributors:Rieskamp, Jörg and Dutilh, Gilles and Pedroni, Andreas and Frey, Renato
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Springer
ISSN:1943-3921
e-ISSN:1943-393X
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:18 May 2018 12:55
Deposited On:06 Feb 2018 08:04

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