Indecision on decisional separability.

Mack ML, Richler JJ, Gauthier I, Palmeri TJ
Psychon Bull Rev. 2011 18 (1): 1-9

PMID: 21327365 · DOI:10.3758/s13423-010-0017-1

The theoretical framework of General Recognition Theory (GRT; Ashby & Townsend, Psychological Review, 93, 154-179, 1986) coupled with the empirical analysis tools of Multidimensional Signal Detection Analysis (MSDA; Kadlec & Townsend, Multidimensional models of perception and recognition, pp. 181-228, 1992) have become one important method for assessing dimensional interactions in perceptual decision-making. In this article, we critically examine MSDA and characterize cases where it is unable to discriminate two kinds of dimensional interactions: perceptual separability and decisional separability. We performed simulations with known instances of violations of perceptual or decisional separability, applied MSDA to the data generated by these simulations, and evaluated MSDA on its ability to accurately characterize the perceptual versus decisional source of these simulated dimensional interactions. Critical cases of violations of perceptual separability are often mischaracterized by MSDA as violations of decisional separability.

MeSH Terms (10)

Decision Making Depth Perception Discrimination (Psychology) Humans Multivariate Analysis Orientation Pattern Recognition, Visual Signal Detection, Psychological Size Perception Uncertainty

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