Cortical alpha activity predicts the confidence in an impending action
Jan Kubanek1, N Jeremy Hill2, Lawrence H Snyder1
1Department of Anatomy and Neurobiology, Washington University School of Medicine St. Louis, MO, USA ; Department of Biomedical Engineering, Washington University in St. Louis St. Louis, MO, USA.
Frontiers in Neuroscience
|August 19, 2015
Summary
Alpha brain activity in humans reflects confidence in upcoming hand movements. This neural signal predicts whether a person will be sure or unsure about their choice, offering insights into decision-making commitment.
Area of Science:
- Neuroscience
- Cognitive Science
- Decision-Making
Background:
- Studies in animals show choice confidence modulates neural activity.
- Understanding subjective confidence in human decision-making is crucial.
Purpose of the Study:
- Investigate the neural representation of choice confidence in humans.
- Determine if specific brain activity correlates with reported confidence levels.
Main Methods:
- Human subjects performed a perceptual decision task (button press vs. saccade).
- Electroencephalography (EEG) recorded brain activity during the task.
- Subjects explicitly reported their confidence (sure/unsure) after each choice.
Main Results:
- Alpha activity in the brain strongly encodes confidence in button press choices.
- This effect was independent of reaction time and decision variables.
- Confidence-related neural activity was specific to button press, not saccade choices.
- Neural signals allowed prediction of subject confidence on a single-trial basis.
Conclusions:
- Alpha activity in human cortex is a reliable neural marker for decision confidence.
- This finding provides a window into the neural commitment to hand movements.
- Highlights the role of specific neural signals in subjective confidence during choices.
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