# Reopening Motor Learning Windows: Targeted Re-Engagement of Latent Pathways via Non-Invasive Neuromodulation

## TL;DR

This paper explores how precise timing and brain states can help rewire motor circuits after injury, offering new strategies for neurorehabilitation.

## Contribution

It introduces a translational framework for neurorehabilitation based on Hebbian and spike-timing-dependent plasticity mechanisms.

## Key findings

- Hebbian and spike-timing-dependent mechanisms govern reorganization across multiple brain regions.
- Durable changes in connectivity and behavior depend on temporal precision and physiological state.
- Metaplastic mechanisms regulate plasticity windows, influencing whether Hebbian processes are activated.

## Abstract

Motor recovery after stroke, spinal cord injury, or traumatic brain injury reflects relearning rather than simple restitution, as surviving circuits retain plastic potential that can be re-engaged through temporally precise stimulation. This review synthesizes convergent findings demonstrating that Hebbian and spike-timing-dependent mechanisms govern reorganization across cortical, striatal, and spinal levels. Leveraging these timing rules to shape excitability during receptive network states enables durable changes in connectivity and behavior. This effect depends on temporal precision, physiological state, and reinforcement—not stimulus intensity alone—within plasticity windows regulated by metaplastic mechanisms that determine whether Hebbian processes are expressed. Together, these principles define a translational framework for neurorehabilitation, emphasizing biomarker-guided, adaptive, and scalable strategies aligned with intrinsic rules of experience-dependent reorganization.