Perception & Psychophysics

, Volume 33, Issue 2, pp 113–120

Quest: A Bayesian adaptive psychometric method


  • Andrew B. Watson
    • NASA Ames Research Center
    • Department of PsychologyStanford University
  • Denis G. Pelli
    • Institute for Sensory ResearchSyracuse University

DOI: 10.3758/BF03202828

Cite this article as:
Watson, A.B. & Pelli, D.G. Perception & Psychophysics (1983) 33: 113. doi:10.3758/BF03202828


An adaptive psychometric procedure that places each trial at the current most probable Bayesian estimate of threshold is described. The procedure takes advantage of the common finding that the human psychometric function is invariant in form when expressed as a function of log intensity. The procedure is simple, fast, and efficient, and may be easily implemented on any computer.

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© Psychonomic Society, Inc 1983