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A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments
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Sequential effects in successive ratio estimation.

Lawrence T DeCarlo1

  • 1Department of Human Development, Box 118, Teachers College, Columbia University, 525 West 120th Street, New York, NY 10027, USA. decarlo@tc.edu

Perception & Psychophysics
|November 2, 2006
PubMed
Summary

Sequential ratio estimation (RE) experiments reveal a positive stimulus context effect. Unlike magnitude estimation (ME), RE sometimes shows negative autocorrelation, explained by perceptual error in a classical ratio estimation model.

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Area of Science:

  • Psychophysics
  • Sensory Perception
  • Cognitive Psychology

Background:

  • Magnitude estimation (ME) and successive ratio estimation (RE) are psychophysical scaling methods.
  • Successive RE involves estimating the ratio of current to previous sensation magnitudes.
  • Stimulus context effects and autocorrelation are key sequential effects in these tasks.

Purpose of the Study:

  • To investigate sequential effects in successive ratio estimation (RE).
  • To compare sequential effects in RE with those found in magnitude estimation (ME).
  • To explore the role of perceptual error and response bias in RE.

Main Methods:

  • Conducted four successive ratio estimation (RE) experiments.
  • Employed procedures similar to magnitude estimation (ME).
  • Analyzed stimulus context effects and residual autocorrelation.

Main Results:

  • A positive stimulus context effect was observed in successive RE, consistent with ME findings.
  • Residual autocorrelation in RE was often zero, but occasionally negative.
  • Negative autocorrelation in RE contrasts with the typically positive autocorrelation in ME.

Conclusions:

  • Successive RE exhibits a positive stimulus context effect.
  • The presence of negative autocorrelation in RE is explained by a classical model incorporating perceptual error.
  • Response bias in RE warrants further investigation.