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1- Faculty of Psychology and Education of University of Tehran, Tehran, Iran.
Abstract:
Background: The brain’s rest-to-task transition requires dynamic Default Mode Network (DMN) reconfiguration. Although DMN activity reflects individual differences, whether intelligence and personality influence the magnitude of DMN change during this transition remains unclear. This study investigated associations between IQ, Big Five traits, and EEG power changes in DMN hubs during visuospatial task engagement.
Method: 36 university students underwent 6-minute resting-state EEG followed by 6-minute Tetris gameplay. Source localization (sLORETA) was performed on 12 DMN regions defined by the Desikan-Killiany atlas. Relative power changes (task–rest) were computed across eight frequency bands. Participants completed the WAIS-IV and NEO-FFI. Partial correlations and regression models examined associations between DMN activity changes, IQ, personality, and game performance.
Results: Among DMN regions showing significant rest-to-task power increases, only the right precuneus and left inferior parietal lobe were associated with intelligence. Right precuneus (Alpha2) and left inferior parietal (Beta1, Beta3) changes showed positive associations with Performance and Full-Scale IQ, with the regression models accounting for 46% and 38% of the variance, respectively (adjusted R²). Left inferior parietal changes (Alpha2, Beta2, Beta3) were negatively correlated with Agreeableness and Extraversion. Personality did not moderate IQ–brain relationships but acted as a suppressor for verbal IQ
Conclusion: Frequency-specific DMN modulation during rest-to-task transition serves as a sensitive neural marker for individual differences in cognitive ability, particularly visuospatial intelligence. Personality traits are independently reflected in DMN dynamics but contribute less to predictive models. Findings highlight the task-dependent specificity of DMN functional reconfiguration and its potential for individualized neuroscience.
Method: 36 university students underwent 6-minute resting-state EEG followed by 6-minute Tetris gameplay. Source localization (sLORETA) was performed on 12 DMN regions defined by the Desikan-Killiany atlas. Relative power changes (task–rest) were computed across eight frequency bands. Participants completed the WAIS-IV and NEO-FFI. Partial correlations and regression models examined associations between DMN activity changes, IQ, personality, and game performance.
Results: Among DMN regions showing significant rest-to-task power increases, only the right precuneus and left inferior parietal lobe were associated with intelligence. Right precuneus (Alpha2) and left inferior parietal (Beta1, Beta3) changes showed positive associations with Performance and Full-Scale IQ, with the regression models accounting for 46% and 38% of the variance, respectively (adjusted R²). Left inferior parietal changes (Alpha2, Beta2, Beta3) were negatively correlated with Agreeableness and Extraversion. Personality did not moderate IQ–brain relationships but acted as a suppressor for verbal IQ
Conclusion: Frequency-specific DMN modulation during rest-to-task transition serves as a sensitive neural marker for individual differences in cognitive ability, particularly visuospatial intelligence. Personality traits are independently reflected in DMN dynamics but contribute less to predictive models. Findings highlight the task-dependent specificity of DMN functional reconfiguration and its potential for individualized neuroscience.
Keywords: Default Mode Network, Rest-to-task transition, Intelligence, Big Five personality, EEG source imaging
Type of Study: Original |
Subject:
Clinical Neuroscience
Received: 2026/02/12 | Accepted: 2026/04/29
Received: 2026/02/12 | Accepted: 2026/04/29
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