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Related Concept Videos

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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
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Related Experiment Video

Updated: Sep 27, 2025

Compensatory Limb Use and Behavioral Assessment of Motor Skill Learning Following Sensorimotor Cortex Injury in a Mouse Model of Ischemic Stroke
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Alien Limb Phenomenon After Diffuse Corpus Callosum Ischemic Stroke.

Peyalee Sarkar1, Biman Kanti Ray1, Debaleena Mukherjee1

  • 1Department of Neuromedicine, Bangur Institute of Neurosciences, Institute of Post Graduate Medical Education and Research & SSKM Hospital, Kolkata, West Bengal, India.

The Neurohospitalist
|April 14, 2022
PubMed
Summary
This summary is machine-generated.

A rare case of alien limb phenomenon occurred in a patient with stroke affecting the corpus callosum. This vascular insult, likely due to intracranial atherosclerotic disease, caused both anterior and posterior circulation issues, leading to autonomous limb behavior.

Keywords:
alien limbcorpus callosumdiagnostic dyspraxiadisconnection syndromeintermanual conflictischemic stroke

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Area of Science:

  • Neurology
  • Vascular Neurology

Background:

  • The alien limb phenomenon is a neurological disorder where a limb acts autonomously, separate from the individual's sense of self.
  • It can manifest with varying clinical features and underlying causes.

Purpose of the Study:

  • To report a unique case of alien limb phenomenon co-occurring with stroke affecting the corpus callosum.
  • To explore the underlying vascular mechanisms, including steal phenomenon, in the context of intracranial atherosclerotic disease.

Main Methods:

  • Case report of a 36-year-old female with recurrent transient ischemic attacks and hemiplegia.
  • Neuroimaging including Magnetic Resonance Imaging (MRI) and Magnetic Resonance Angiography (MRA).
  • Digital subtraction angiography to assess cerebral blood flow.

Main Results:

  • The patient presented with limb-shaking transient ischemic attacks, hemiplegia, and subsequent alien limb phenomenon with visuospatial deficits.
  • Brain MRI revealed diffuse ischemic stroke involving the corpus callosum.
  • Angiography indicated compromised right anterior circulation and reduced flow in the right internal carotid artery, suggesting a steal phenomenon.

Conclusions:

  • Diffuse corpus callosum infarction can result from compromised anterior and posterior circulation.
  • Intracranial atherosclerotic disease with a potential steal phenomenon is a probable mechanism for such strokes.
  • This case highlights the co-existence of anterior and posterior alien limb phenomenon types secondary to cerebrovascular disease.