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Scale-Free Neural and Physiological Dynamics in Naturalistic Stimuli Processing.
Amy Lin1, Brian Maniscalco2, Biyu J He3
1National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA; Semel Institute for Neuroscience and Human Behavior, University of California-Los Angeles, Los Angeles, California 90095.
Eneuro
|November 9, 2016
Summary
Brain activity, including slow cortical potentials (SCPs) and alpha oscillations, exhibits scale-free dynamics. This study reveals interrelations between neural dynamics and heartbeat, impacting auditory task performance.
Area of Science:
- Neuroscience
- Physiology
- Complex Systems
Background:
- Neural activity often displays arrhythmic fluctuations with 1/f-type power spectra, indicating scale-free dynamics.
- Scale-free dynamics are observed in slow cortical potentials (SCPs), alpha oscillation amplitude, and heartbeat.
- The relationship between these scale-free neural and physiological dynamics is not well understood.
Purpose of the Study:
- To investigate the interrelations among scale-free dynamics in SCPs, alpha oscillations, and heartbeat.
- To explore the role of scale-free neural dynamics in processing natural stimuli with scale-free properties.
- To determine if these dynamics predict performance in auditory discrimination tasks.
Main Methods:
- Simultaneous magnetoencephalography (MEG) and electrocardiography (ECG) recordings in healthy subjects.
- Resting-state and auditory discrimination task conditions.
- Analysis of scale-free dynamics using power-law exponents (β) in SCPs, alpha-amplitude, and heartbeat.
Main Results:
- Long-range temporal correlation in SCPs positively correlated with heartbeat dynamics within individuals.
- Long-range temporal correlation in SCPs negatively correlated with alpha-amplitude fluctuations across individuals.
- Scale-free dynamics of both SCPs and alpha-amplitude predicted auditory task performance, showing antagonistic relationships.
Conclusions:
- Reveals interrelations between different scale-free neural and physiological dynamics.
- Provides evidence for the involvement of scale-free neural dynamics in processing natural, scale-free stimuli.
- Highlights antagonistic roles of SCP and alpha-amplitude dynamics in cognitive performance.
Keywords:
arrhythmic brain activityheart rate variabilitynatural stimuliscale-free dynamicsslow cortical potentialsα oscillations
