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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Visual working memory (WM) capacity is limited, affecting both actively held and passively stored information.
  • The interaction between actively perceived visual stimuli and stored WM content remains incompletely understood.
  • Understanding resource allocation in visual WM is crucial for explaining cognitive limitations.

Purpose of the Study:

  • To investigate if concurrent visual stimuli interfere with visual working memory (WM) representations.
  • To determine if this interference is modulated by the storage state (active vs. silent) of WM contents.
  • To explore the resource sharing mechanisms between active perception and visual WM.

Main Methods:

  • Experiment 1: Participants performed a change-detection task under simultaneous representation (WM content and visible stimuli) versus a baseline condition.
  • Experiment 2: A dual-serial retro-cue paradigm was used to manipulate WM storage states (active and silent).
  • Electrophysiological measures (e.g., CDA amplitude) and behavioral performance were analyzed.

Main Results:

  • Concurrent representation of visible stimuli impaired visual WM performance and reduced the contralateral delay activity (CDA) amplitude in Experiment 1.
  • In Experiment 2, interference primarily affected WM representations maintained in the active state, not the silent state.
  • These findings indicate state-dependent resource competition in visual WM.

Conclusions:

  • Visual WM representations in the active state share limited cognitive resources with concurrently perceived visual information.
  • The study provides evidence for a dissociation between active and silent storage states in visual WM.
  • Resource limitations in visual perception and working memory are state-dependent.