Categorizing Externally Distributed Stimulus Samples for Unequal Molar Probabilities

M K Janke

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Decision-Making and Behavioral Economics Probability and Statistical Research Categorization, perception, and language

Abstract

40 Ss categorized random samples from one of two normal distributions and then received feedback. The over-all, molar probabilities of samples for the two distributions were .35 and .65. Problem-solving or Gambling instructions, and distributions on a Dot position or a Number continuum, were combined factorially with sex. There were no main instructional effects. Performance was superior on the position continuum ( p < .01). Over-all performance resembled micromatching of probabilities at each continuum position, but some Ss responded independently of sample position. The molar probability of response “1” for the Dot group was less (.295) than the molar reinforcement level ( p < .001). There were no main sex effects. Distance between centers was overestimated for Dot but not for the Number continuum.

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References

1962Dynamic Decision Theory and Probabilistic Information Processings 1959Theoretical Models of Choice and Strategy Behavior: Stable State Behavior in the Two-Choice Uncertain Outcome Situation

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2002TOWARD A UNIFIED THEORY OF DECISION CRITERION LEARNING IN PERCEPTUAL CATEGORIZATION 1998Base-rate and payoff effects in multidimensional perceptual categorization.1977The decision rule in probabilistic categorization: What it is and how it is learned.1998Stimulus Categorization 2003On the generality of optimal versus objective classifier feedback effects on decision criterion learning in perceptual categorization 2003A theoretical framework for understanding the effects of simultaneous base-rate and payoff manipulations on decision criterion learning in perceptual categorization.1967A test of Luce’s two-state decision rule 1975The a priori estimation of subjective uncertainty in human sequential predictive behavior.

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