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Measurement error in subliminal perception experiments: simulation analyses of two regression methods.

J Miller1

  • 1Department of Psychology, University of Otago, Dunedin, New Zealand. miller@otago.ac.nz

Journal of Experimental Psychology. Human Perception and Performance
|August 18, 2000
PubMed
Summary
This summary is machine-generated.

This study questions the evidence for subliminal perception. Regression analysis used to detect dissociation between direct and indirect measures may produce misleading results, even without true subliminal perception.

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Area of Science:

  • Cognitive Psychology
  • Psychophysics

Background:

  • Subliminal perception research often relies on dissociation between direct and indirect measures.
  • Regression-based tests have been employed to infer subliminal perception.

Purpose of the Study:

  • To critically evaluate the validity of regression-based tests for detecting dissociation in subliminal perception.
  • To examine whether significant positive intercepts in regression analysis reliably indicate subliminal perception.

Main Methods:

  • Utilized regression analysis to predict indirect perception from direct measures.
  • Simulated data under conditions where regression assumptions were violated.
  • Reviewed theoretical plausibility and empirical consistency of existing methods.

Main Results:

  • Simulations demonstrated that significant positive intercepts can arise even without true dissociation when regression assumptions are unmet.
  • The assumptions underlying the regression-based dissociation test were found to be theoretically implausible.
  • Empirical results were inconsistent with some aspects of the dissociation argument.

Conclusions:

  • The significant positive intercept is not robust evidence for a dissociation between direct and indirect measures of perception.
  • The employed regression-based methods may not reliably support claims of subliminal perception.
  • Re-evaluation of existing evidence for subliminal perception is warranted.