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Related Experiment Videos

Horizontal-vertical illusion: continuous decrement or the deviant first guess?

Jaanus Raudsepp1

  • 1Department of Psychology, Umeå University, Sweden. jaanus.raudsepp@psy.umu.se

Perceptual and Motor Skills
|May 25, 2002
PubMed
Summary

The horizontal-vertical illusion

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Area of Science:

  • Visual perception
  • Psychophysics

Background:

  • Repetitive inspection causes short-term decrement in the horizontal-vertical illusion.
  • Previous theories assumed a gradual decline in illusion magnitude.

Purpose of the Study:

  • Investigate if the illusion decrement is gradual or a singular drop-off.
  • Examine the role of initial assessment in illusion magnitude.

Main Methods:

  • 111 students performed 8 successive line adjustment trials.
  • Participants adjusted lines to match perceived equal length.

Main Results:

  • A significant part of the illusion magnitude depends on the first impression.
  • Illusion decrement appears as a one-step drop, not gradual decline.

Conclusions:

  • Existing theories do not fully explain the observed one-step decrement.
  • A motor theory of illusion may better account for the findings.

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