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Lateralization01:28

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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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Language serves as a bridge between ideas and communication, influencing how individuals perceive and interact with the world. Psychologists have long debated whether language shapes thought or vice versa. This discussion gained grip with Edward Sapir and Benjamin Lee Whorf in the 1940s, who proposed that language determines thought, a concept known as linguistic determinism. They suggested that the vocabulary and structure of a language influence how its speakers think and perceive reality.
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Utilizing Repetitive Transcranial Magnetic Stimulation to Improve Language Function in Stroke Patients with Chronic Non-fluent Aphasia
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Functional MRI for language lateralization in individuals with intellectual and cognitive dysfunction: Two clinical

A Omisade1,2, C O'Grady3, R M Sadler4

  • 1Acquired Brain Injury (Epilepsy Program), Nova Scotia Health Authority, Halifax, Canada.

The Clinical Neuropsychologist
|March 14, 2020
PubMed
Summary

Task-based functional MRI (fMRI) successfully lateralized language dominance in two patients with intellectual disabilities. This study introduces a novel fMRI paradigm for this patient group, overcoming previous accuracy concerns.

Keywords:
Cognitive dysfunctionFunctional MRIepilepsyintellectual disabilitylanguage dominanceneurosurgery

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Area of Science:

  • Neuroimaging
  • Epilepsy Surgery
  • Cognitive Neuroscience

Background:

  • Task-based functional MRI (fMRI) is standard for pre-surgical language lateralization in epilepsy.
  • Its accuracy is questioned in patients with cognitive dysfunction or IQ < 70.
  • This limits its application in a vulnerable patient population.

Purpose of the Study:

  • To demonstrate the successful use of task-based fMRI for language lateralization in individuals with cognitive dysfunction and intellectual disability.
  • To present a specific fMRI paradigm suitable for this patient group.
  • To address the limitations of current fMRI protocols in neurosurgical planning.

Main Methods:

  • Two patients with intellectual disability underwent pre-surgical epilepsy evaluation.
  • A comprehensive neuropsychological assessment was performed.
  • An fMRI paradigm included semantic fluency, sentence completion, naming, and listening tasks with visual and auditory stimuli.

Main Results:

  • fMRI successfully lateralized language dominance in both patients.
  • Results correlated with other clinical data, including intraoperative cortical mapping in one case.
  • The developed fMRI paradigm proved effective for language lateralization.

Conclusions:

  • Task-based fMRI can be successfully applied to lateralize language in adult patients with cognitive and intellectual disabilities.
  • This study is the first to report successful language lateralization using fMRI in this population.
  • A specific, effective fMRI paradigm for this group is proposed.