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Scale-Free Neural and Physiological Dynamics in Naturalistic Stimuli Processing.
- Source :
-
ENeuro [eNeuro] 2016 Oct 24; Vol. 3 (5). Date of Electronic Publication: 2016 Oct 24 (Print Publication: 2016). - Publication Year :
- 2016
-
Abstract
- Neural activity recorded at multiple spatiotemporal scales is dominated by arrhythmic fluctuations without a characteristic temporal periodicity. Such activity often exhibits a 1/ f -type power spectrum, in which power falls off with increasing frequency following a power-law function: [Formula: see text], which is indicative of scale-free dynamics. Two extensively studied forms of scale-free neural dynamics in the human brain are slow cortical potentials (SCPs)-the low-frequency (<5 Hz) component of brain field potentials-and the amplitude fluctuations of α oscillations, both of which have been shown to carry important functional roles. In addition, scale-free dynamics characterize normal human physiology such as heartbeat dynamics. However, the exact relationships among these scale-free neural and physiological dynamics remain unclear. We recorded simultaneous magnetoencephalography and electrocardiography in healthy subjects in the resting state and while performing a discrimination task on scale-free dynamical auditory stimuli that followed different scale-free statistics. We observed that long-range temporal correlation (captured by the power-law exponent β) in SCPs positively correlated with that of heartbeat dynamics across time within an individual and negatively correlated with that of α-amplitude fluctuations across individuals. In addition, across individuals, long-range temporal correlation of both SCP and α-oscillation amplitude predicted subjects' discrimination performance in the auditory task, albeit through antagonistic relationships. These findings reveal interrelations among different scale-free neural and physiological dynamics and initial evidence for the involvement of scale-free neural dynamics in the processing of natural stimuli, which often exhibit scale-free dynamics.<br />Competing Interests: Authors report no conflict of interest
Details
- Language :
- English
- ISSN :
- 2373-2822
- Volume :
- 3
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- ENeuro
- Publication Type :
- Academic Journal
- Accession number :
- 27822495
- Full Text :
- https://doi.org/10.1523/ENEURO.0191-16.2016