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Higher Mental Functions of the Brain: Language01:10

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Language is a system of communication that allows the expression of thoughts, ideas, and feelings. The brain processes language in both hemispheres.
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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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Visual Agnosia

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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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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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Updated: Aug 21, 2025

Utilizing Repetitive Transcranial Magnetic Stimulation to Improve Language Function in Stroke Patients with Chronic Non-fluent Aphasia
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Thalamic Aphasia: a Review.

Merve Fritsch1, Ida Rangus2,3, Christian H Nolte2,3

  • 1Department of Psychiatry and Psychotherapy, Charité-Universitätsmedizin Berlin, Campus Mitte, Charitéplatz 1, 10117, Berlin, Germany. merve.fritsch@charite.de.

Current Neurology and Neuroscience Reports
|November 16, 2022
PubMed
Summary
This summary is machine-generated.

Thalamic aphasia, a rare language disorder from thalamus lesions, presents varied symptoms, often mild lexical-semantic issues. Research is ongoing to understand its mechanisms and diverse phenotypes, as it may be underdiagnosed.

Keywords:
Lexical-semantic deficitsSubcortical aphasiaThalamic aphasiaThalamo-cortical language networks

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Area of Science:

  • Neuroscience
  • Neurolinguistics
  • Clinical Neurology

Background:

  • Thalamic aphasia is a rare language disorder caused by damage to the thalamus.
  • Symptoms typically involve lexical-semantic deficits, but phenotypes can vary.
  • The precise mechanisms underlying thalamic aphasia remain largely unexplored.

Purpose of the Study:

  • To review recent findings on the phenotypes of thalamic aphasia.
  • To explore potential underlying mechanisms contributing to the disorder.
  • To highlight the need for further empirical research in this area.

Main Methods:

  • Review of recent scientific literature on thalamic aphasia.
  • Analysis of reported phenotypes and lesion locations.
  • Discussion of proposed neurobiological mechanisms.

Main Results:

  • Phenotypic variations in thalamic aphasia correlate with specific lesion locations within the thalamus.
  • The thalamus's role in language is linked to cortico-thalamic networks and potential monitoring functions.
  • Diachisis, the remote effect of a lesion, may contribute to language deficits in interconnected areas.

Conclusions:

  • Recent findings offer a clearer understanding of thalamic aphasia phenotypes and mechanisms.
  • Further research is crucial to fully elucidate the thalamus's role in language processing.
  • Thalamic aphasia may be underdiagnosed due to subtle symptoms not detected by standard language tests.