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Transcranial Direct Current Stimulation over the Posterior Parietal Cortex Increases Nontarget Retrieval during

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Summary
This summary is machine-generated.

Transcranial direct current stimulation (tDCS) over the posterior parietal cortex (PPC) impairs feature binding in visual working memory (VWM). This impairment affects response speed and preference, highlighting the PPC's causal role in VWM.

Keywords:
content–context bindingoccipital cortexposterior parietal cortextranscranial direct current stimulationvisual working memory

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Human Brain Research

Background:

  • Visual working memory (VWM) relies on accurate feature binding.
  • The posterior parietal cortex (PPC) is implicated in VWM feature binding.
  • The causal role of the PPC in VWM feature binding requires further investigation.

Purpose of the Study:

  • To causally investigate the role of the posterior parietal cortex (PPC) in feature binding during visual working memory (VWM).
  • To examine the effects of transcranial direct current stimulation (tDCS) over the PPC on VWM performance.
  • To differentiate the impact of PPC stimulation on misbinding versus informed guessing.

Main Methods:

  • Three transcranial direct current stimulation (tDCS) experiments were conducted.
  • Participants completed delayed estimation and change detection tasks.
  • tDCS was applied over the PPC, occipital cortex, or sham condition.

Main Results:

  • PPC stimulation selectively increased recall response time (RT) and the probability of nontarget responses (pNT), indicating impaired feature binding.
  • The effects of PPC stimulation on RT were more pronounced in informed guessing trials compared to misbinding trials.
  • PPC stimulation did not affect recognition RT or accuracy in a change detection task.

Conclusions:

  • Direct causal evidence supports the specific involvement of the PPC in feature binding during VWM retrieval.
  • PPC stimulation impacts both the speed and response preference aspects of VWM feature binding.
  • These findings advance the understanding of the neural underpinnings of feature binding in VWM.