Related Experiment Video
Updated: Jun 9, 2026
13:12
Translational Brain Mapping at the University of Rochester Medical Center: Preserving the Mind Through Personalized Brain Mapping
Published on: August 12, 2019
Refined analysis of complex language representations by non-invasive neuroimaging techniques
Takahiro Ota1, Kyousuke Kamada, Kensuke Kawai
1Department of Neurosurgery, The University of Tokyo, Tokyo, Japan.
British Journal of Neurosurgery
|September 10, 2010
Summary
Near-infrared spectroscopy (NIRS), functional MRI (fMRI), and magnetoencephalography (MEG) show promise for determining language lateralisation. These non-invasive methods offer potential as alternatives to the Wada test for patients with neurological conditions.
Area of Science:
- Neuroscience
- Medical Imaging
- Neurology
Background:
- Accurate language lateralisation is crucial for patients with epilepsy or brain tumors to prevent post-surgical language deficits.
- The Wada test is the current standard but is invasive.
Purpose of the Study:
- To evaluate the clinical usefulness of near-infrared spectroscopy (NIRS) for identifying language lateralisation.
- To compare NIRS with functional MRI (fMRI) and magnetoencephalography (MEG) in multiple language tasks.
Main Methods:
- 28 patients with known language dominance (via Wada test) underwent fMRI, MEG, and NIRS.
- Language lateralisation was assessed using a laterality index during silent word reading (fMRI/MEG) and word generation (NIRS).
Main Results:
- High concordance (85.7%) was observed between NIRS, fMRI, MEG, and the Wada test.
- MEG demonstrated the highest sensitivity (100%) and specificity (87.5%) for left dominance.
- NIRS uniquely identified right-sided language representation in three patients.
Conclusions:
- Co-utilising fMRI, MEG, and NIRS provides a reliable method for determining language lateralisation.
- NIRS, fMRI, and MEG can detect atypical language representation.
- These non-invasive techniques show potential as alternatives to the Wada test with further research.
Related Concept Videos
01:10Higher Mental Functions of the Brain: Language
Language is a system of communication that allows the expression of thoughts, ideas, and feelings. The brain processes language in both hemispheres.
Language formation and comprehension take place in the dominant hemisphere. The dominant hemisphere is responsible for understanding the meaning of spoken, written, or sign language, as well as the ability to communicate. For most people, the left hemisphere is the dominant one. The right hemisphere, then, gives tone and emotional context to the...
Language formation and comprehension take place in the dominant hemisphere. The dominant hemisphere is responsible for understanding the meaning of spoken, written, or sign language, as well as the ability to communicate. For most people, the left hemisphere is the dominant one. The right hemisphere, then, gives tone and emotional context to the...
01:27Language and Cognition
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.