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All identical objects reduce memory load at the late maintenance stage in working memory.

Lijing Guo1,2, Hyung-Bum Park3, Guofang Ren1

  • 1School of Education, Anyang Normal University, Anyang, China.

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|May 14, 2025
PubMed
Summary
This summary is machine-generated.

Identical visual stimuli improve visual working memory (VWM) performance by reducing resource consumption during the late maintenance phase, not early encoding. This benefit emerges only when all items are identical.

Keywords:
Contralateral delay activityIdentical objectsOrientation stimulusPerceptual organizationVisual short-term memory

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Area of Science:

  • Cognitive Neuroscience
  • Psychology

Background:

  • Visual working memory (VWM) has limited capacity.
  • Perceptual organization, like grouping identical objects, may reduce VWM load.
  • Mechanisms by which object identity affects VWM capacity are not fully understood.

Purpose of the Study:

  • To investigate if identical orientation stimuli reduce VWM resource consumption.
  • To determine if this reduction occurs during encoding or maintenance.
  • To explore the impact of complete vs. partial stimulus identity on VWM.

Main Methods:

  • Used contralateral delay activity (CDA), an ERP component indexing VWM load.
  • Compared three conditions: all-same, partial-same, and all-different orientations.
  • Analyzed behavioral performance and ERP amplitudes during encoding and maintenance.

Main Results:

  • Behavioral performance improved with increased stimulus identity, peaking in the all-same condition.
  • Early CDA amplitudes showed no significant differences across conditions.
  • Late CDA amplitudes were reduced in the all-same condition, indicating reduced VWM load during maintenance.

Conclusions:

  • Identical stimuli do not reduce VWM load during early encoding or maintenance.
  • The facilitative effect of identical objects on VWM emerges during the late maintenance phase.
  • Complete repetition of stimuli is crucial for VWM benefits; partial repetition does not confer the same advantage.