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Related Experiment Video

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Modulating Cognition Using Transcranial Direct Current Stimulation of the Cerebellum
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Transcranial direct current stimulation facilitates decision making in a probabilistic guessing task.

David Hecht1, Vincent Walsh, Michal Lavidor

  • 1Department of Psychology, University of Hull, Hull HU6 7RX, United Kingdom. davidh.research@gmail.com

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 26, 2010
PubMed
Summary

Humans often guess by matching past event frequencies. This study found left hemisphere stimulation influenced probabilistic guessing, making participants quicker to choose the most frequent outcome.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Behavior

Background:

  • Human guessing behavior in random binary events often involves matching past frequencies.
  • Previous research suggests hemispheric asymmetry: left hemisphere (LH) matches frequencies, right hemisphere (RH) maximizes by choosing the most frequent option.

Purpose of the Study:

  • To investigate the hemispheric asymmetry hypothesis of probabilistic guessing using transcranial direct current stimulation (tDCS).
  • To explore the role of the left and right dorsolateral prefrontal cortex in decision-making strategies during a probabilistic guessing task.

Main Methods:

  • Participants engaged in a probabilistic guessing task.
  • tDCS was applied to modulate activity in the dorsolateral prefrontal cortex of each hemisphere.
  • Three conditions were tested: RH anodal/LH cathodal, LH anodal/RH cathodal, and no stimulation.

Main Results:

  • No significant difference in guessing strategy was observed across the three tDCS conditions, with participants predominantly matching frequencies.
  • When LH received anodal tDCS and RH received cathodal tDCS, participants showed increased speed in selecting the most frequent alternative.

Conclusions:

  • The findings support the involvement of the left hemisphere in probabilistic learning and reasoning.
  • Modulating left prefrontal cortex activity with tDCS can alter decision-making bias towards maximizing strategies.