Related Experiment Video
Updated: Jul 4, 2026
07:49
Simultaneous Photothrombosis and Fiber Photometry to Induce and Monitor Ischemic Stroke in Behaving Mice
Published on: November 14, 2025
Slow Oscillations Track Acute Stroke Injury but Not Functional Recovery
Jake Lee1, Arnav Ajay Jadav1, Eric C Landsness1
1Department of Neurology, Washington University in St. Louis, St. Louis, MO 63110, USA.
Biorxiv : the Preprint Server for Biology
|July 3, 2026
Summary
Stroke suppresses cortical slow oscillations (SOs), but their recovery does not predict functional improvement. Instead, pre-stroke SO balance across hemispheres is key for predicting forelimb use recovery after stroke.
Area of Science:
- Neuroscience
- Stroke Research
- Brain Oscillations
Background:
- Cortical slow oscillations (SOs) are crucial brain rhythms suppressed by ischemic stroke.
- SO recovery is often considered a marker of neural reorganization and functional restoration post-stroke.
- The link between SO recovery and behavioral improvement, and the role of pre-stroke network organization, remain unclear.
Purpose of the Study:
- To investigate whether slow oscillation (SO) recovery correlates with behavioral recovery after stroke in individual animals.
- To determine if pre-stroke network organization influences post-stroke functional recovery.
- To assess if SO suppression acutely reflects injury severity beyond lesion volume.
Main Methods:
- Longitudinal wide-field calcium imaging was used in Thy1-GCaMP6f mice (n=25) to track ipsilateral and contralateral SO power.
- Measurements were taken at baseline, 24 hours, and one week after photothrombotic stroke of the forepaw cortex.
- Animals were classified based on the presence (STI+) or absence (STI-) of secondary thalamic injury.
Main Results:
- Acute ipsilateral SO power suppression correlated with behavioral deficits, indicating dysfunction beyond lesion volume.
- By one week, SO power recovered but was dissociated from forelimb use recovery; recovery was equivalent in animals with and without secondary thalamic injury.
- Pre-stroke SO laterality (interhemispheric balance) predicted week 1 forelimb use, independent of infarct size.
Conclusions:
- Acute SO suppression accurately reflects stroke injury severity, but SO recovery does not predict functional recovery.
- Pre-stroke interhemispheric SO balance is a significant prognostic factor for functional recovery after stroke.
- These findings highlight the importance of pre-injury brain state in predicting stroke outcomes and suggest separating oscillatory recovery from functional recovery metrics.
Related Concept Videos
01:15Ischemic Stroke ll: Pathophysiology
An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...
01:15Ischemic Stroke l: Introduction
Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.