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Alexander von Lautz1, Jan Herding1, Felix Blankenburg1

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This study integrates tactile and visual decision-making tasks, revealing that prefrontal beta band activity tracks working memory for visual stimuli. This supports evidence accumulation as a general decision-making mechanism across senses.

Keywords:
Beta oscillationsCentro-parietal positivityDecision makingEEGRandom-dot motionSequential comparisonWorking memory

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Area of Science:

  • Cognitive Neuroscience
  • Perceptual Decision Making
  • Electrophysiology

Background:

  • Perceptual decision making research utilizes distinct paradigms: vibrotactile frequency comparison (working memory) and random-dot motion (evidence accumulation).
  • Previous studies show neural correlates like firing rates and beta oscillations in somatosensory tasks, and increased potentials in visual tasks, suggesting different mechanisms.

Purpose of the Study:

  • To bridge the gap between somatosensory and visual decision-making paradigms by using a sequential visual comparison task.
  • To investigate neural mechanisms underlying working memory and evidence accumulation in a unified experimental framework.

Main Methods:

  • Human volunteers performed a sequential visual random-dot motion comparison task.
  • Electroencephalography (EEG) was recorded to analyze brain activity.
  • Analysis focused on prefrontal beta band power modulations and centro-parietal signal build-up.

Main Results:

  • Prefrontal beta band power modulated with the coherence of the initial visual stimulus during a retention interval, indicating working memory involvement.
  • Beta power in premotor areas correlated with participant choices ~700 ms prior to response.
  • A build-up of centro-parietal signals occurred until response, varying with trial difficulty, consistent with evidence accumulation.

Conclusions:

  • Neural modulations of beta power observed in tactile working memory tasks extend to the visual domain.
  • The findings support evidence accumulation as a flexible decision-making mechanism applicable across different sensory modalities and task types.