Dynamic Routing on a Static Structure: Neuromodulatory Gating of Cortical Wave Propagation

Transient noradrenergic (NA) modulation in an empirically grounded corticothalamic neural field model gates cortical traveling waves, producing spatiotemporally sustained propagation, unlike sustained modulation or no modulation.

• Why it matters: Evoked cortical activity can be localized or form traveling waves, but the mechanism for flexibly switching between these regimes using fixed anatomy is unclear.
• What they did: The authors extend a corticothalamic neural field model with a diffusely projecting modulatory population parameterized on the locus coeruleus (LC) NA arousal system, comparing phasic versus tonic modulation and adding distance-dependent connectivity plus fast-conducting non-local projections (FNPs).
• The result: Transient modulation shortens and patterns wave-onset latency and imposes anisotropy, restricting propagation to modulated territories and halting it across unmodulated gaps; with FNPs, modulation enables rapid non-local activation for selective long-distance routing.

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