Three cooperative mechanisms required for recovery after brain damage

TL;DR

This paper explains how three key mechanisms—plastic adaptation, hyperexcitability, and synaptogenesis—work together to enable brain recovery after stroke, highlighting their combined necessity for restoring neural activity.

Contribution

It identifies and demonstrates the essential combined role of three mechanisms in neural recovery post-stroke through computational modeling.

Findings

Individual mechanisms contribute partially to recovery.

Only the combined mechanisms fully restore spontaneous activity.

Different damage types activate distinct recovery processes.

Abstract

Stroke is one of the main causes of human disabilities. Experimental observations indicate that several mechanisms are activated during the recovery of functional activity after a stroke. Here we unveil how the brain recovers by explaining the role played by three mechanisms: Plastic adaptation, hyperexcitability and synaptogenesis. We consider two different damages in a neural network: A diffuse damage that simply causes the reduction of the effective system size and a localized damage, a stroke, that strongly alters the spontaneous activity of the system. Recovery mechanisms observed experimentally are implemented both separately and in a combined way. Interestingly, each mechanism contributes to the recovery to a limited extent. Only the combined application of all three together is able to recover the spontaneous activity of the undamaged system. This explains why the brain triggers independent mechanisms, whose cooperation is the fundamental ingredient for the system recovery.