What question did this study set out to answer?

The aim is to explore how task difficulty influences theta oscillations during perceptual decision-making.

January 25, 2026Brain SciencesOpen Access

Frontal Theta Oscillations in Perceptual Decision-Making Reflect Cognitive Control and Confidence

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Examines how theta activity varies with task difficulty, suggesting implications for cognitive control and confidence levels.

The aim is to explore how task difficulty influences theta oscillations during perceptual decision-making.
Acquired EEG data from 26 healthy adults performing a face/house categorization task.
Utilized images with varying levels of clarity: clear, moderate, and high noise.
Analyzed theta dynamics through current source density time courses and single-trials.
Employed Wilcoxon signed-rank tests with false discovery rate correction for analysis.
Greater frontal theta power was observed for clear stimuli compared to noisy ones (p < 0.001).
Frontoparietal theta coupling varied with stimulus clarity in both evoked and induced synchronization.
Phase-locked (evoked) synchronization had a stronger effect than ongoing (induced) synchronization.

Parajuli et al. (2026) studied this question.

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