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Ischemic Stroke l: Introduction

Ischemic 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.

Ischemic Stroke ll: Pathophysiology

Ischemic 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...

Hemorrhagic Stroke l: Introduction

Hemorrhagic Stroke l: Introduction

A hemorrhagic stroke is an acute neurological event that occurs when a weakened cerebral blood vessel ruptures, allowing blood to accumulate within or around the brain. The sudden release of blood forms a focal hematoma that increases intracranial pressure, displaces neural tissue, and can obstruct cerebrospinal fluid pathways. These effects may be compounded by intraventricular extension of the hemorrhage, cerebral edema, or compression of adjacent structures, all of which contribute to...

Hemorrhagic Stroke ll: Pathophysiology

Hemorrhagic Stroke ll: Pathophysiology

A hemorrhagic stroke develops when a cerebral blood vessel ruptures, allowing blood to escape into the surrounding brain tissue, as in intracerebral hemorrhage (ICH), or into the subarachnoid space, as in subarachnoid hemorrhage (SAH). Because the skull is a rigid compartment, the sudden presence of extravascular blood rapidly increases intracranial pressure and compresses adjacent neural structures, leading to immediate tissue injury and impaired cerebral perfusion.Mass Effect and Primary...

Transient Ischemic Attack l: Introduction

Transient Ischemic Attack l: Introduction

A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...

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Motor Imagery Brain-Computer Interface in Rehabilitation of Upper Limb Motor Dysfunction After Stroke

Motor Imagery Brain-Computer Interface in Rehabilitation of Upper Limb Motor Dysfunction After Stroke

Published on: September 1, 2023

Relational processing following stroke.

Glenda Andrews¹, Graeme S Halford, David Shum

¹Behavioural Basis of Health Program, Griffith Health Institute & School of Applied Psychology, Griffith University, Gold Coast Campus, 4222, Australia. g.andrews@griffith.edu.au

Brain and Cognition

|November 24, 2012

Summary

This summary is machine-generated.

Stroke impairs relational processing, particularly at intermediate complexity levels. Frontal stroke patients showed greater deficits, suggesting specific brain region involvement in this cognitive function.

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Published on: December 28, 2014

Area of Science:

Cognitive Neuroscience
Neuropsychology
Neurology

Background:

Relational processing is crucial for complex cognition.
Stroke can significantly impact cognitive functions.
Understanding stroke-related cognitive deficits is vital for rehabilitation.

Purpose of the Study:

To investigate relational processing deficits after stroke.
To determine the impact of lesion location (frontal vs. non-frontal) on relational processing.
To explore the domain-general nature of relational processing.

Main Methods:

Stroke patients (frontal and non-frontal lesions) and controls completed four relational processing tasks.
Tasks varied in relational complexity (binary, ternary, quaternary).
Performance was analyzed based on lesion status and task complexity.

Main Results:

Stroke groups exhibited impaired relational processing, especially on ternary-relational tasks.
Frontal stroke patients showed greater impairment than non-frontal stroke patients.
Performance on binary and quaternary tasks was less affected by stroke status.

Conclusions:

Relational processing is vulnerable to stroke, particularly at intermediate complexity.
Frontal lobe integrity is important for complex relational processing.
Findings support a domain-general model of relational processing and have implications for assessment and intervention strategies.