Intrinsic space-time couplings governing multi-scale cortical dynamics

Area of Science:

• Neuroscience
• Biophysics
• Systems Neuroscience

Background:

• The neocortex is a key target for neuromodulation, but its global operational principles remain elusive.
• Existing technologies struggle to simultaneously capture cortex-wide activity and millisecond neuronal firing resolution.

Purpose of the Study:

• To introduce and apply a novel microscopy technique for high-resolution, large-scale brain activity tracking.
• To identify fundamental principles governing neocortical dynamics and organization.

Main Methods:

• Conformal immersion microscopy enabling cortex-wide activity tracking with millisecond temporal and 100 μm spatial resolution.
• Multiscale analysis applying physics-based frameworks to neural activity data.
• Perturbation studies using pharmacological, optogenetic, and genetic interventions.

Main Results:

• Identified a fundamental frequency-dependent coherence length partitioning the neocortex into discrete dynamical elements.
• Demonstrated conserved dynamics across sub-threshold and suprathreshold neural activity regimes.
• Showed robustness of these dynamical elements to various interventions, with conditions for overriding boundaries.

Conclusions:

• Conformal immersion microscopy provides unprecedented spatiotemporal resolution for neocortical dynamics.
• Fundamental dynamical elements and their scale-invariant properties govern neocortical organization.
• Findings offer a foundation for mechanistically informed basic and translational neuromodulation research.