Takashi Amita

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An intriguing application of neuroimaging is directly measuring actual human brain activities during daily living. To this end, we investigated cortical activation patterns during apple peeling. We first conducted a pilot study to assess the activation pattern of the whole lateral cortical surface during apple peeling by multichannel near-infrared(More)
We investigate whether the functional near-infrared spectroscopic (fNIRS) signal includes a signal from the changing skin blood flow. During a locomotor task on a treadmill, changes in the hemodynamic response in the front-parietal area of healthy human subjects are simultaneously recorded using an fNIRS imaging system and a laser Doppler tissue blood flow(More)
High-density diffuse optical tomography (HD-DOT) is an emerging technique for visualizing the internal state of biological tissues. The large number of overlapping measurement channels due to the use of high-density probe arrays permits the reconstruction of the internal optical properties, even with a reflectance-only measurement. However, accurate(More)
Functional near-infrared spectroscopy (fNIRS) can non-invasively measure hemodynamic responses in the cerebral cortex with a portable apparatus. However, the observation signal in fNIRS measurements is contaminated by the artifact signal from the hemodynamic response in the scalp. In this paper, we propose a method to separate the signals from the cortex(More)
Diffuse optical tomography (DOT) is an emerging technology for improving the spatial resolution and spatial specificity of conventional multi-channel near-infrared spectroscopy (NIRS) by the use of high-density measurements and an image reconstruction algorithm. We recently proposed a hierarchical Bayesian DOT algorithm that allows for accurate simultaneous(More)
Brain-machine interfaces (BMI) are expected as new man-machine interfaces. Non-invasive BMI have the potential to improve the quality of life of many disabled individuals with safer operation. The non-invasive BMI using the functional functional near-infrared spectroscopy (fNIRS) with the electroencephalogram (EEG) has potential applicability beyond the(More)
Diffuse optical tomography (DOT) is emerging technology to improve spatial resolution of conventional multichannel near infrared spectroscopy (NIRS). Although the scalp blood flow heavily contaminates the cerebral blood flow, all of previously proposed DOT algorithms fail to provide a way to segregate these two components. Here we propose a hierarchical(More)
UNLABELLED Much interest has been focused on standardization of measurement of expired nitric oxide (NO) concentration. The aim of this study was establish a simple measurement of expired NO concentration. SUBJECTS AND METHODS This study included 5 healthy male adults. To clarify whether NO is excreted in expired air constantly, its concentrations were(More)
The purpose of this study is to compare diffuse axonal injury (DAI) patients with healthy controls by using near infrared spectroscopy (NIRS). The Wisconsin Card Sorting Test Keio Version (KWCST), a standard task paradigm to detect human frontal lobe dysfunction was set as a method. The result of the examination showed that compared with DAI patients, wider(More)
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