Non-invasive assessment of language dominance with near-infrared spectroscopic mapping

Watanabe, Eiju; Maki, Atsushi; Kawaguchi, Fumio; Takashiro, Kaoru; Yamashita, Yuichi; Koizumi, Hideaki; Mayanagi, Yoshiaki

doi:10.1016/s0304-3940(98)00754-x

Cited by 233 publications

(137 citation statements)

References 16 publications

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“…This suggests that the finger tapping task induced hemodynamic changes in the motor cortex. This result supported previous studies (1,3,20). Alcohol intake affects the motor cortex (14) and motor performance (15)(16)(17).…”

Section: Resultssupporting

confidence: 92%

“…An optical topography system, which is based on nearinfrared spectroscopy (1)(2)(3)(4), is a non invasive technique with high temporal resolution for imaging hemodynamic changes induced by brain function (1). It has become possible to measure brain functions under various conditions (1)(2)(3)(4)(5)(6).…”

Section: Introductionmentioning

confidence: 99%

“…It has become possible to measure brain functions under various conditions (1)(2)(3)(4)(5)(6). The small size of the system means that subjects do not require as much restraint as with other measurement systems; e.g., electroencephalography (EEG), functional magnetic resonance imaging (fMRI), positron emission tomography (PET), and magnetoencephalography (MEG).…”

Section: Introductionmentioning

confidence: 99%

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Application of specific brain function evaluation by optical topography

Obata

Morimoto

Takeshita

et al. 2003

Environ Health Prev Med

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Objectives: To use the evaluation of a specific brain function obtained by optical topography. This system uses a non invasive method to measure brain function, unlike other major systems.Methods: Twelve optical fibers were attached to the subject's head. Hemodynamic changes in the motor cortex were measured during finger tapping before and after alcohol intake for each ALDH2 genotype.Results: Different hemodynamic changes in the motor cortex were observed among the ALDH2 genotypes.Conclusions: Optical topography is a useful tool for evaluating specific brain functions. Further research is needed on the relations between various environmental factors and brain functions by optical topography.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Application of specific brain function evaluation by optical topography

Obata

Morimoto

Takeshita

et al. 2003

Environ Health Prev Med

View full text Add to dashboard Cite

show abstract

“…Beyond this shortcoming fNIRS combines a number of features extremely attractive for language research. Being compatible with a natural environment and silent, the method's advantage has been proven in a number of previous studies in language research even in earliest infanthood (Fallgatter et al, 1998;Herrmann et al, 2006;Homae et al, 2006;Horovitz and Gore, 2004;Noguchi et al, 2002;Pena et al, 2003;Taga et al, 2003;Wartenburger et al, 2007, Watanabe et al, 1998. Here we challenge the methodology's potential to explore its versatility and reliability to differentiate activation in the three target areas discussed above (SFG/IPG/IFG).…”

Section: Introductionmentioning

confidence: 97%

Differential activation of frontal and parietal regions during visual word recognition: An optical topography study

et al. 2008

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The present study examined cortical oxygenation changes during lexical decision on words and pseudowords using functional NearInfrared Spectroscopy (fNIRS). Focal hyperoxygenation as an indicator of functional activation was compared over three target areas over the left hemisphere. A 52-channel Hitachi ETG-4000 was used covering the superior frontal gyrus (SFG), the left inferior parietal gyrus (IPG) and the left inferior frontal gyrus (IFG). To allow for anatomical inference a recently developed probabilistic mapping method was used to determine the most likely anatomic locations of the changes in cortical activation [Tsuzuki, D., Jurcak, V., Singh, A.K., Okamoto, M., Watanabe, E., Dan, I., 2007. Virtual spatial registration of stand-alone fNIRS data to MNI space. NeuroImage 43 (4), 1506-1518.Subjects made lexical decisions on 50 low and 50 high frequency words and 100 pseudowords. With respect to the lexicality effect, words elicited a larger focal hyperoxygenation in comparison to pseudowords in two regions identified as the SFG and left IPG. The SFG activation difference was interpreted to reflect decision-related mechanisms according to the Multiple Read-Out Model [Grainger, J., Jacobs, A.M., 1996. Orthographic processing in visual word recognition: A multiple read-out model. Psychological Review 103, 518-565]. The greater oxygenation response to words in the left IPG suggests that this region connects orthographic, phonological and semantic representations. A decrease of deoxygenated hemoglobin was observed to low frequency in comparison to high frequency words in a region identified as IFG. This region's sensitivity to word frequency suggests its involvement in grapheme-phoneme conversion, or its role during the selection of preactivated semantic candidates.

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“…Cerebral oximeters should be equipped with an indicator of signal quality and strength to distinguish physiological declines from artefacts. In the future, the ability to detect and observe the progress of cerebral events as they occur will require NIRS devices that can accurately measure photon path length [20] and integrate data from multiple detectors [38] into tomographic images. When the technical problems are solved, NIRS devices promise to become valuable tools in monitoring intracranial oxygen saturation in patients at cerebral risk.…”

Section: Transcranial Cerebral Oximetrymentioning

confidence: 99%