Abstract
Glickman, Gray, and Morales (this issue) propose a statistical model for measuring the unobserved latency of stimulus-controlled processes. The model accounts for both speed and accuracy and does so by assuming participants set an internal deadline. If a stimulus-controlled response is not produced by the deadline, the participant then guesses. The applicability the model is discussed in this comment. The deadline model yields specific predictions for the case in which stimulus difficulty is manipulated in a within-block manner. In this case, it is reasonable to assume that stimulus difficulty does not affect the deadline. It is shown that in common perceptual and cognitive domains, extant data do not fully meet these predictions. Hence, practitioners need be aware of the possibility and consequences of model misspecification.
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This research is supported by NSF grant SES - 0095919 to J. Rouder, D. Sun, and P. Speckman.
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Rouder, J.N. The applicability of deadline models: Comment on Glickman, Gray, and Morales (2005). Psychometrika 70, 427–430 (2005). https://doi.org/10.1007/s11336-004-1215-4
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DOI: https://doi.org/10.1007/s11336-004-1215-4