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Preservation and Changes in Oscillatory Dynamics across the Cortical Hierarchy
Mikael Lundqvist1,2, André M Bastos1, Earl K Miller1
1Massachusetts Institute of Technology.
Journal of Cognitive Neuroscience
|June 24, 2020
Summary
Brainwave rhythms like theta, alpha, beta, and gamma share similar functions across cortical areas. However, their frequencies increase with higher levels of the cortical hierarchy, influencing neural processing.
Area of Science:
- Neuroscience
- Computational Neuroscience
Background:
- Cortical rhythms including theta (2-8 Hz), alpha (8-12 Hz), beta (12-35 Hz), and gamma (>35 Hz) are widespread in the brain.
- Their functional similarities and properties across different cortical regions remain poorly understood due to limited comparative studies.
Purpose of the Study:
- To investigate whether common cortical rhythms exhibit similar relationships with neuronal activity across distinct cortical areas.
- To explore how these rhythmic properties vary along the cortical hierarchy.
Main Methods:
- Simultaneous recordings of neuronal spikes and local field potentials (LFPs) were conducted in visual, parietal, and prefrontal cortices of monkeys.
- Analysis focused on comparing the characteristics of theta, alpha, beta, and gamma oscillations in relation to spiking activity across hierarchical levels.
Main Results:
- Theta, alpha, beta, and gamma oscillations demonstrated consistent relationships with spiking activity in visual, parietal, and prefrontal cortices.
- A notable finding was the progressive increase in oscillation frequencies across all studied bands as recordings moved up the cortical hierarchy.
Conclusions:
- The findings suggest that these fundamental brain rhythms possess conserved inhibitory and excitatory functions throughout the cortex.
- The observed increase in frequency along the cortical hierarchy may play a crucial role in modulating neural communication and information processing flow.
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