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Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
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Related Experiment Video

Updated: Sep 25, 2025

A Cognitive Paradigm to Investigate Interference in Working Memory by Distractions and Interruptions
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Luminance Contrast Drives Interactions between Perception and Working Memory.

Maciej Kosilo1,2, Jasna Martinovic3, Corinna Haenschel1

  • 1City, University of London, United Kingdom.

Journal of Cognitive Neuroscience
|April 25, 2022
PubMed
Summary
This summary is machine-generated.

Visual working memory (WM) is more efficient for luminance than color, especially for shape recognition. This suggests a direct link between low-level perception and visual memory encoding.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Visual working memory (WM) guides behavior using past sensory input.
  • Current lab tasks often isolate WM from sensory processing.
  • Understanding perception-WM interaction is key to real-world visual guidance.

Purpose of the Study:

  • Investigate how visual working memory differs for stimuli processed via distinct visual pathways.
  • Determine if luminance or chromatic signals are more efficient for WM encoding, maintenance, and recognition.
  • Explore the neural basis of potential differences in WM efficiency.

Main Methods:

  • Conducted a delayed shape recognition task.
  • Performed psychophysical experiments measuring contrast thresholds under varying WM loads.
  • Utilized electroencephalography (EEG) to analyze early sensory responses.

Main Results:

  • Luminance contrast was encoded into WM more efficiently than chromatic contrast, even when equated for discriminability.
  • Early sensory EEG responses specific to luminance pathways were modulated by WM load.
  • Findings were not explained by simple saliency differences between luminance and color.

Conclusions:

  • Visual working memory shows enhanced efficiency for luminance compared to chromatic signals.
  • Luminance plays a crucial role in forming WM representations of shape.
  • Results demonstrate a direct connection between low-level perceptual mechanisms and visual working memory.