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Traumatic Brain Injury l: Introduction

Traumatic Brain Injury l: Introduction

DefinitionTraumatic brain injury, or TBI, is a disturbance of normal brain function induced by an external mechanical force, such as a direct blow to the head or a penetrating injury. It can affect both brain structure and function, producing a wide range of clinical outcomes. TBI is a heterogeneous condition, meaning its effects may differ based on the type, location, and severity of the injury.Basis of ClassificationTBI is classified based on severity, injury mechanism, or pathophysiology. In...

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Updated: May 2, 2026

Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury

Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury

Published on: November 19, 2012

Behavioral Deficits and Cortical Network Dysfunction Following Repeated Mild Traumatic Brain Injuries.

Natalie J Pinkowski^1,2,3, Brandi R Hess^1,2, Johann M Pacheco^1,2,4

¹Department of Neurosciences, University of New Mexico School of Medicine, Albuquerque, New Mexico, USA.

Journal of Neurotrauma

|March 14, 2026

Summary

This summary is machine-generated.

Repeated mild traumatic brain injuries (mTBIs) in mice cause behavioral deficits. These injuries are linked to spreading depolarizations (SDs), which disrupt brain activity and worsen outcomes.

Keywords:

behavioral assessment electrophysiology vascular reactivity

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Published on: April 11, 2025

Area of Science:

Neuroscience
Traumatic Brain Injury Research

Background:

Mild traumatic brain injury (mTBI) affects millions annually, causing diverse acute symptoms.
The neurological mechanisms underlying mTBI symptoms are not fully understood.

Purpose of the Study:

To investigate the link between repeated mTBIs and behavioral deficits.
To explore the role of spreading depolarizations (SDs) in mTBI-related dysfunction.

Main Methods:

Utilized a mouse model of repeated closed skull mTBIs.
Employed optogenetics to induce SDs and assess behavioral changes.
Performed in vivo electrophysiology to monitor cortical network activity.

Main Results:

Repeated mTBIs induced acute behavioral deficits in mice.
Optogenetically induced SDs mimicked these behavioral deficits.
Cortical network activity depression following SDs correlated with motor deficits.

Conclusions:

Repeated mTBIs and SDs are associated with significant behavioral impairments.
SDs may be a key mechanism contributing to post-mTBI dysfunction.