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Perception is a fundamental psychological process that enables individuals to organize, interpret, and consciously experience sensory information. This process is crucial for understanding and interacting with the world around us. It includes both bottom-up and top-down processing, each playing a distinct role in how we perceive our environment.
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Independent short- and long-term dependencies in perception.

Toni P Saarela1,2, Saija M Niemi1,3, Maria Olkkonen1,4

  • 1Department of Psychology and Logopedics, Faculty of Medicine, University of Helsinki, Haartmaninkatu 3, 00014 University of Helsinki, Helsinki, Finland.

Journal of Vision
|May 15, 2023
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Summary
This summary is machine-generated.

Perceptual biases like central-tendency bias (CTB) and serial dependence (SD) independently affect judgments. Analyzing both CTB and SD is crucial for accurate understanding of perceptual data.

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Area of Science:

  • Cognitive Psychology
  • Computational Neuroscience
  • Visual Perception

Background:

  • Perception is influenced by stimulus history, leading to biases.
  • Central-tendency bias (CTB) and serial dependence (SD) are known perceptual biases.
  • Research on CTB and SD has largely progressed independently, despite correlated stimulus statistics.

Purpose of the Study:

  • To compare central-tendency bias (CTB) and serial dependence (SD) in color and line length perception.
  • To investigate the role of elapsed time versus intervening stimuli in serial dependence.
  • To determine if CTB and SD independently influence perceptual judgments.

Main Methods:

  • Observers performed a delayed-matching task for color hue and line length.
  • Psychometric functions and generalized linear mixed models were used to estimate biases.
  • Two interstimulus intervals were employed to differentiate time and stimulus count effects.

Main Results:

  • Both recent stimulus history (SD) and cumulative average (CTB) biases were observed for color and line length.
  • The strength and pattern of biases varied depending on whether both CTB and SD were considered.
  • For SD, the number of intervening stimuli was more critical than elapsed time.

Conclusions:

  • Serial dependence (SD) and central-tendency bias (CTB) are independent factors influencing perceptual judgments.
  • Neither SD nor CTB is an artifact of the other.
  • Failure to account for both biases can lead to misinterpretations in perceptual research.