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Serial dependence in time and numerosity perception is dimension-specific.

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Serial dependence biases current perception towards prior stimuli. This study found that this bias operates specifically within a stimulus dimension, not across different dimensions like duration and numerosity.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Psychophysics

Background:

  • Perceptual experiences can bias the perception of subsequent stimuli.
  • Serial dependence is a bias where current stimuli appear more similar to preceding ones.
  • It is unclear if serial dependence operates across multiple dimensions of the same visual stimulus.

Purpose of the Study:

  • To investigate whether serial dependence operates simultaneously across different dimensions of a visual stimulus.
  • Specifically, to assess serial dependence across stimulus duration and numerosity.

Main Methods:

  • Participants performed either a duration or numerosity discrimination task.
  • A task-irrelevant inducer stimulus, varying in both duration and numerosity, preceded the reference stimulus.
  • Serial dependence was measured by comparing perception with and without the inducer.

Main Results:

  • Systematic serial dependencies were observed only within the task-relevant dimension (duration affected duration perception, numerosity affected numerosity perception).
  • The task-irrelevant dimension of the inducer showed no attractive serial dependence.
  • A repulsive effect was observed from the task-irrelevant dimension in the numerosity task.

Conclusions:

  • Attractive serial dependence is dimension-specific and does not transfer across different stimulus dimensions.
  • Perceptual adaptation may underlie the repulsive influence that can transfer across dimensions.