Publications by authors named "Minako Uga"

Significance: The advancement of multichannel functional near-infrared spectroscopy (fNIRS) has enabled measurements across a wide range of brain regions. This increase in multiplicity necessitates the control of family-wise errors in statistical hypothesis testing. To address this issue, the effective multiplicity ( ) method designed for channel-wise analysis, which considers the correlation between fNIRS channels, was developed.

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Article Synopsis
  • Learning a second language involves individual differences, such as sex and working memory, that affect how well people process the language.
  • In tests, girls outperformed boys in both language proficiency and working memory, with girls showing a correlation between their language skills and memory capacity.
  • Neuroimaging results indicated that boys focused more on rule-based syntax processing while girls utilized a broader set of linguistic skills, suggesting different approaches to language learning.
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Article Synopsis
  • Multichannel near-infrared spectroscopy (NIRS) is a noninvasive method for measuring blood oxygenation changes in the brain, allowing for the analysis of resting state functional connectivity (RSFC).
  • A study involving 17 healthy participants utilized a multi-distance probe arrangement and independent component analysis to separate brain signals, finding that partial correlation analysis effectively reduced external noise and yielded significant connectivity results.
  • The method demonstrated notable RSFC patterns between brain regions, with females showing increased connectivity in certain areas compared to males, indicating NIRS's potential for studying neural networks and sex differences in brain activity.
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While a growing body of neurocognitive research has explored the neural substrates associated with attention deficit hyperactive disorder (ADHD), an objective biomarker for diagnosis has not been established. The advent of functional near-infrared spectroscopy (fNIRS), which is a noninvasive and unrestrictive method of functional neuroimaging, raised the possibility of introducing functional neuroimaging diagnosis in young ADHD children. Previously, our fNIRS-based measurements successfully visualized the hypoactivation pattern in the right prefrontal cortex during a go/no-go task in ADHD children compared with typically developing control children at a group level.

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Noninvasive localization of an epileptogenic zone is a fundamental step for presurgical evaluation of epileptic patients. Here, we applied long-term simultaneous functional near-infrared spectroscopy (fNIRS)/electroencephalogram (EEG) monitoring for focus diagnosis in patients with mesial temporal lobe epilepsy (MTLE). Six MTLE patients underwent long-term (8-16 h per day for 4 days) fNIRS/EEG monitoring for the occurrence of spontaneous seizures.

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Recent advances in multichannel functional near-infrared spectroscopy (fNIRS) allow wide coverage of cortical areas while entailing the necessity to control family-wise errors (FWEs) due to increased multiplicity. Conventionally, the Bonferroni method has been used to control FWE. While Type I errors (false positives) can be strictly controlled, the application of a large number of channel settings may inflate the chance of Type II errors (false negatives).

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An increasing number of functional near-infrared spectroscopy (fNIRS) studies utilize a general linear model (GLM) approach, which serves as a standard statistical method for functional magnetic resonance imaging (fMRI) data analysis. While fMRI solely measures the blood oxygen level dependent (BOLD) signal, fNIRS measures the changes of oxy-hemoglobin (oxy-Hb) and deoxy-hemoglobin (deoxy-Hb) signals at a temporal resolution severalfold higher. This suggests the necessity of adjusting the temporal parameters of a GLM for fNIRS signals.

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Functional near-infrared spectroscopy (fNIRS) is a neuroimaging technique for the noninvasive monitoring of human brain activation states utilizing the coupling between neural activity and regional cerebral hemodynamics. Illuminators and detectors, together constituting optodes, are placed on the scalp, but due to the presence of head tissues, an inter-optode distance of more than 2.5cm is necessary to detect cortical signals.

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There is an increasing need for a pig model for use in functional brain studies, but a system for determining precise stereotactic coordinates has yet to be developed. Thus, we devised a frameless navigation system for stereotactic positioning, and measured coordinates for the rostral region and the primary somatosensory cortex in the pig brain. Raw coordinates for somatic evoked potential recordings were obtained by passive optical tracking.

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In order to investigate how the diaphragm and trunk muscles are recruited during various voluntary movements, we recorded EMG signals and video images simultaneously and analyzed EMGs of the diaphragm and trunk muscles during the voluntary movements that required trunk muscles. During trunk movements, the duration of the diaphragmatic activity became irregular and the intensity of the activity increased. Further analysis revealed that the diaphragmatic activities were consisted of two components, such as respiratory and non-respiratory activities during voluntary movements.

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The diaphragm is an important inspiratory muscle, and is also known to participate in the postural function. However, the activity of the diaphragm during voluntary movements has not been fully investigated in awake animals. In order to investigate the diaphragmatic activity during voluntary movements such as extending or rotating their body, we analyzed the electromyogram (EMG) of the diaphragm and trunk muscles in the cat using a technique for simultaneous recordings of EMG signals and video images.

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