Background: Stroke is a leading cause of neurological disability, often resulting in long-term motor impairments due to damage to cortical or subcortical motor areas. Despite the high prevalence of subcortical strokes in the clinical population, preclinical research has primarily focused on investigating and treating cortical strokes. Moreover, while both humans and animals show spontaneous recovery following stroke, little is known about how injury location affects this process.
Objective: To capture the heterogeneity of human stroke and examine how stroke location affects spontaneous motor recovery following damage to cortical, subcortical, or a combination of both areas.
Methods: Endothelin-1 (ET-1), a potent vasoconstrictor, was used to produce focal infarcts in the forelimb motor cortex (FMC), the dorsolateral striatum (DLS) or both the FMC and DLS in male Sprague-Dawley rats. The spontaneous recovery profile of animals was followed over an 8-week period using a battery of behavioral tasks assessing motor function and limb preference.
Results: All 3 groups showed significant impairments on the Montoya staircase, beam, and cylinder tests following stroke, with the combined group (FMC + DLS) having the largest and most persistent impairments. Importantly, spontaneous recovery was not simply dependent on lesion volume, but on location, and the behavioral test employed.
Conclusions: Stroke location markedly and differentially influences the level of spontaneous functional recovery, which is only captured by using multiple outcome measures. These results illustrate the need for preclinical stroke models to align with the heterogeneity of human stroke, especially with respect to lesion location, size, and outcome measures.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1177/1545968318817823 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Pearls & Oy-sters: Increased Visibility of Focal Cortical Dysplasia in Cerebral MRI During the First Year of Life.
Neurology
January 2025
Faculty of Medicine, University of Geneva, Switzerland.
Early detection of focal cortical dysplasia (FCD) using brain MRI in young children presenting with drug-resistant epilepsy may facilitate prompt surgical treatment, resulting in better control of seizures and decreased associated cognitive difficulties. Characteristics of FCD described in the literature are predominantly based on MRI findings in a fully myelinated brain; therefore, changes occurring during early brain maturation are not well known. In this case report, we describe distinct MRI features of a FCD visualized best before completion of myelination of the cortex and subcortical white matter.
View Article and Find Full Text PDFCortical and subcortical gray matter volume and cognitive impairment in Parkinson's disease.
Appl Neuropsychol Adult
December 2024
Department of Biostatistics, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran.
Introduction: This study investigated the cortical and subcortical gray matter volume (GMV) and cognitive impairment (CI) in patients with Parkinson's disease (PD).
Methods: In this study, T1-weighted magnetic resonance imaging of the cortex and subcortex was conducted on 92 individuals diagnosed with PD and 92 healthy controls (HCs). PD patients were divided into three groups: PD with normal cognition (PD-NC, = 21), PD with mild CI (PD-MCI, = 43), and PD with severe CI (PD-SCI, = 28).
Imaging in atypical van der knaap disease with subependymal nodular heterotopia: A case report.
Radiol Case Rep
February 2025
Junior Resident, Department of Radiodiagnosis, Kempegowda Institute of Medical Sciences Hospital and Research Centre, Rajiv Gandhi University of Health Sciences, Bangalore, 560004, Karnataka, India.
Here, we discuss a rare and to our knowledge, the first case of an atypical Van der Knaap's disease in a 6-year-old boy who presented with motor difficulties, developmental delay, cognitive impairment, seizures. The objective of this report is to highlight its unusual findings on MRI including internal capsule, brainstem, cerebellum involvement; subependymal nodular heterotopia, subependymal cysts, cortical laminar necrosis along with typical findings of megalencephalic leukoencephalopathy and subcortical cysts. The study also underscores the clinical implications of this complex pathology, with emphasis on comprehensive neuroradiological evaluation for atypical presentations to guide better diagnostic and management outcomes.
View Article and Find Full Text PDFBeyond awareness: the binding of reflexive mechanisms with the conscious mind: a perspective from default space theory.
Front Hum Neurosci
December 2024
Charitable Medical Healthcare Foundation, Augusta, GA, United States.
How do reflexes operate so quickly with so much multimodal information on the environment? How might unconscious processes help reveal the nature of consciousness? The Default Space Theory of Consciousness (DST) offers a novel way to interpret these questions by describing how sensory inputs, cognitive functions, emotional states, and unconscious processes are integrated by a single unified internal representation. Recent developments in neuroimaging and electrophysiology, such as fMRI, EEG, and MEG, have improved our knowledge of the brain mechanisms that underpin the conscious mind and have highlighted the importance of neural oscillations and sensory integration in its formation. In this article, we put forth a perspective on an underresearched relationship of reflexes with the dynamic character of consciousness and suggest that future research should focus on the interplay of the unconscious processes of reflexes and correlates of the contents of consciousness to better understand its nature.
View Article and Find Full Text PDFA multi-parametric MRI study on changes in the structure, function, and connectivity of thalamic subregions and their relationship with cognitive impairment in patients with subcortical ischemic vascular disease.
Brain Res
December 2024
Department of Radiology, the First Affiliated Hospital of Chongqing Medical University, Chongqing, China. Electronic address:
Introduction: Prior researches have reported abnormal changes of thalamus in patients with subcortical ischemic vascular disease (SIVD), which was usually analyzed as a whole. However, it was currently unclear whether the structure, function and connectivity of thalamic subregions were differentially affected by this disease and affected different cognitive functions.
Methods: This study recruited 30 SIVD patients with cognitive impairment (SIVD-CI), 30 SIVD patients with cognitive unimpaired (SIVD-CU) and 32 normal controls.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!