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Aperiodic and oscillatory systems underpinning human domain-general cognition
Runhao Lu1, Nadene Dermody2, John Duncan2
1MRC Cognition and Brain Sciences Unit, University of Cambridge, Cambridge, UK. Runhao.Lu@mrc-cbu.cam.ac.uk.
Communications Biology
|December 18, 2024
Summary
This study reveals that both aperiodic and oscillatory brain signals are crucial for domain-general cognition. Aperiodic broadband power, in particular, plays a key role in signaling cognitive demand across tasks.
Area of Science:
- Neuroscience
- Cognitive Science
- Electrophysiology
Background:
- Domain-general cognitive systems enable adaptive human behavior through flexible neural mechanisms.
- Functional magnetic resonance imaging (fMRI) studies associate frontoparietal network activation with increased task demands, but electrophysiological underpinnings remain unclear.
Purpose of the Study:
- To investigate the electrophysiological mechanisms of domain-general cognition.
- To differentiate the roles of aperiodic and oscillatory components in responding to cognitive demand.
Main Methods:
- Magnetoencephalography (MEG) and electroencephalography (EEG) were employed.
- Signals were decomposed into aperiodic and oscillatory components.
- Multivariate analysis was applied across three distinct cognitive tasks.
Main Results:
- Both aperiodic (broadband power, slope, intercept) and oscillatory (theta, alpha, beta power) components encoded task demand and content.
- Aperiodic broadband power significantly generalized across tasks in coding demand.
- Increased cognitive demand correlated with decreased aperiodic broadband power, particularly within the frontoparietal network.
Conclusions:
- Aperiodic broadband power is a critical electrophysiological marker of domain-general cognitive demand.
- Oscillatory activity showed more localized modulations compared to the widespread effects of aperiodic activity.
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