Further tests of a two-state model for choice reaction times

Stephen J. Lupker*, John Theios

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)


    J. C. Falmagne proposed that choice reaction times (RTs) can be described by a simple model involving 2 states of perceptual-motor preparation. S. J. Lupker and J. Theios (1975) found support for the model in an n-choice (n = 4, 6) RT task in which stimulus presentation probability was varied as π for one stimulus but was constrained as (1 - π)/(n - 1) for all the remaining stimuli. The present experiments with 30 undergraduates involve 4- and 6-choice tasks in which the stimuli differed in their individual presentation probabilities. Sequential mean RTs and various properties of the RT distributions were considered. The model was able to predict with reasonable accuracy all the sequential mean RTs except those for alternating stimulus sequences. The fixed point and other distributional properties seemed to hold on a general level. Detailed inspection, however, revealed a few systematic deviations between the data and distributional properties predicted by the 2-state model. (PsycINFO Database Record (c) 2006 APA, all rights reserved).

    Original languageEnglish
    Pages (from-to)496-504
    Number of pages9
    JournalJournal of Experimental Psychology: Human Perception and Performance
    Issue number3
    Publication statusPublished - Aug 1977


    • stimuli presentation probabilities, test of 2-state perceptual-motor preparation model used to predict choice RTs, college students

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