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The interpretation of behavior-model correlations in unidentified cognitive models

期刊

PSYCHONOMIC BULLETIN & REVIEW
卷 28, 期 2, 页码 374-383

出版社

SPRINGER
DOI: 10.3758/s13423-020-01783-y

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Decision making; Math modeling; Signal detection theory; Reinforcement learning

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The rise of computational modeling in the past decade has led to an increase in papers reporting parameter estimates. Model identification requires specific parameter settings, and caution is advised against overinterpreting the associative relations found.
The rise of computational modeling in the past decade has led to a substantial increase in the number of papers that report parameter estimates of computational cognitive models. A common application of computational cognitive models is to quantify individual differences in behavior by estimating how these are expressed in differences in parameters. For these inferences to hold, models need to be identified, meaning that one set of parameters is most likely, given the behavior under consideration. For many models, model identification can be achieved up to a scaling constraint, which means that under the assumption that one parameter has a specific value, all remaining parameters are identified. In the current note, we argue that this scaling constraint implies a strong assumption about the cognitive process that the model is intended to explain, and warn against an overinterpretation of the associative relations found in this way. We will illustrate these points using signal detection theory, reinforcement learning models, and the linear ballistic accumulator model, and provide suggestions for a clearer interpretation of modeling results.

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