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Related Experiment Videos

Visible persistence following a brief increment in stimulus luminance.

C D Clark1, J H Hogben

  • 1Department of Psychology, University of Western Australia, Nedlands.

Perception & Psychophysics
|March 1, 1991
PubMed
Summary

Visible persistence, the perceived duration of a stimulus, can be extended by a luminance increment. This effect is not due to total light changes but is time-locked to the luminance event, suggesting a reinitiation process.

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Area of Science:

  • Psychology
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Visible persistence, the subjective extension of a stimulus's perceived duration, can be modulated by luminance changes.
  • Previous research indicated that a brief luminance increment before stimulus offset extends visible persistence.

Purpose of the Study:

  • To investigate whether the extension of visible persistence by a luminance increment is an artifact of altered total luminous flux.
  • To determine the temporal dynamics and underlying mechanisms of luminance-induced visible persistence.

Main Methods:

  • Utilized a two-component pattern integration task to measure visible persistence.
  • Manipulated stimulus luminance and luminance increments prior to stimulus offset.

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Main Results:

  • The extension of visible persistence by a luminance increment was not dependent on changes in total luminous flux.
  • Visible persistence remained unaffected by the overall luminance of the stimulus.
  • The effect was time-locked to the luminance increment, indicating a reinitiation of the underlying perceptual process.

Conclusions:

  • Visible persistence results from a process initiated by stimulus onset, which can be reinitiated by a subsequent luminance increment.
  • The duration of this perceptual process, and thus stimulus visibility, can be modulated by post-initiation stimulus events.
  • A single-process inhibitory feedback model is proposed to explain the observed mechanisms of visible persistence.