The damaged connectome: Mechanisms and consequences of brain network reorganization following neurotrauma

Traumatic brain injury (TBI) represents a major cause of chronic disability worldwide, with outcomes that are notoriously heterogeneous and difficult to predict. This heterogeneity stems from the fact that TBI is not merely a focal injury but a whole-brain network disorder. The brain's structural and functional organization-the connectome-is profoundly disrupted by traumatic forces. However, the post-injury period is not static; it is characterized by a dynamic, multi-stage process of reorganization that unfolds from hours to years. This review synthesizes current evidence on how neurotrauma dismantles brain networks and how the brain subsequently attempts to repair and reconfigure itself. We explore the cellular and systems-level mechanisms of neuroplasticity, the advanced neuroimaging techniques used to measure network changes, and the critical distinction between adaptive and maladaptive reorganization. Finally, we discuss the therapeutic implications of this network-oriented perspective, highlighting neuromodulation, cognitive rehabilitation, and pharmacological interventions as tools to guide recovery, and conclude by outlining key future directions for the field.