Development of a Multi-channel, Portable Optical Topography System

Atsumori, Hirokazu; Kiguchi, Masashi; Obata, Akiko; Sato, Hiroki; Katura, Takusige; Utsugi, Kei; Funane, Tsukasa; Maki, Atsushi

doi:10.1109/iembs.2007.4353051

Cited by 23 publications

(17 citation statements)

References 8 publications

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“…Therefore, trained subjects could potentially practice cognitive training tasks at home using the learned metacognitive strategy. Nonetheless, new generation NIRS systems are more portable/wearable and affordable (Atsumori et al 2007; Sagara et al 2009; Lareau et al 2011) and have the potential to be used with personal computers in the near future (Sagara et al 2009). We did not follow-up the participants to investigate the long-term effect of training.…”

Section: Discussionmentioning

confidence: 99%

Task-based neurofeedback training: A novel approach toward training executive functions

et al. 2016

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Cognitive training is an emergent approach to improve cognitive functions in various neurodevelopmental and neurodegenerative diseases. However, current training programs can be relatively lengthy, making adherence potentially difficult for patients with cognitive difficulties. Previous studies suggest that providing individuals with real-time feedback about the level of brain activity (neurofeedback) can potentially help them learn to control the activation of specific brain regions. In the present study, we developed a novel task-based neurofeedback training paradigm that benefits from the effects of neurofeedback in parallel with computerized training. We focused on executive function training given its core involvement in various developmental and neurodegenerative diseases. Near-infrared spectroscopy (NIRS) was employed for providing neurofeedback by measuring changes in oxygenated hemoglobin in the prefrontal cortex. Of the twenty healthy adult participants, ten received real neurofeedback (NFB) on prefrontal activity during cognitive training, and ten were presented with sham feedback (SHAM). Compared with SHAM, the NFB group showed significantly improved executive function performance including measures of working memory after four sessions of training (100 minutes total). The NFB group also showed significantly reduced training-related brain activity in the executive function network including right middle frontal and inferior frontal regions compared with SHAM. Our data suggest that providing neurofeedback along with cognitive training can enhance executive function after a relatively short period of training. Similar designs could potentially be used for patient populations with known neuropathology, potentially helping them to boost/recover the activity in the affected brain regions.

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Section: Discussionmentioning

confidence: 99%

Task-based neurofeedback training: A novel approach toward training executive functions

et al. 2016

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“…The details of the WOT system are described previously. [27][28][29] The WOT system is small, light, and covers the entire forehead. The probe positions of the light sources and detectors and the channel positions of the WOT system are shown in Fig.…”

Section: Near-infrared-spectroscopy Measurementmentioning

confidence: 99%

“…We used a wearable-optical-topography (WOT) system based on near-infrared spectroscopy (NIRS) [27][28][29] because this system can simultaneously measure the brain activities of two or more people who are interacting in a natural manner, namely, dur-ing face-to-face communication. An NIRS system measures the changes in cerebral blood volume by radiating weak visible or near-infrared light into the head and detecting the transmitted light from another position.…”

Section: Introductionmentioning

confidence: 99%

Synchronous activity of two people's prefrontal cortices during a cooperative task measured by simultaneous near-infrared spectroscopy

et al. 2011

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Abstract. The brain activity during cooperation as a form of social process is studied. We investigate the relationship between coinstantaneous brain-activation signals of multiple participants and their cooperative-task performance. A wearable near-infrared spectroscopy (NIRS) system is used for simultaneously measuring the brain activities of two participants. Each pair of participants perform a cooperative task, and their relative changes in cerebral blood are measured with the NIRS system. As for the task, the participants are told to count 10 s in their mind after an auditory cue and press a button. They are also told to adjust the timing of their button presses to make them as synchronized as possible. Certain information, namely, the "intertime interval" between the two button presses of each participant pair and which of the participants was the faster, is fed back to the participants by a beep sound after each trial. When the spatiotemporal covariance between the activation patterns of the prefrontal cortices of each participant is higher, the intertime interval between their button-press times was shorter. This result suggests that the synchronized activation patterns of the two participants' brains are associated with their performance when they interact in a cooperative task. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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“…This technique is used to evaluate brain activities by measuring changes in the concentrations of oxygenated hemoglobin (ΔC oxy ), deoxygenated hemoglobin (ΔC deoxy ), and the total hemoglobin (ΔC total ) in the blood flowing through the cerebral cortex. The technique is not only non-invasive but also unrestrictive and does not require fixed, bulky equipment [17]. Our approach is to utilize the blood volume change within the brain as a switching signal for external device operation [18].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a 2-Channel NIRS-Based Optical Brain Switch for Motor Disabilities' Communication Tools

Sagara

Kido

2012

IEICE Trans. Inf. & Syst.

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SUMMARYWe have developed a portable NIRS-based optical BCI system that features a non-invasive, facile probe attachment and does not require muscle movement to control the target devices. The system consists of a 2-channel probe, a signal-processing unit, and an infrared-emission device, which measures the blood volume change in the participant's prefrontal cortex in a real time. We use the threshold logic as a switching technology, which transmits a control signal to a target device when the electrical waveforms exceed the pre-defined threshold. Eight healthy volunteers participated in the experiments and they could change the television channel or control the movement of a toy robot with average switching times of 11.5 ± 5.3 s and the hit rate was 83.3%. These trials suggest that this system provides a novel communication aid for people with motor disabilities. key words: brain-computer interface (BCI), brain switch, near-infrared spectroscopy (NIRS)

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Development of a Multi-channel, Portable Optical Topography System

Cited by 23 publications

References 8 publications

Task-based neurofeedback training: A novel approach toward training executive functions

Task-based neurofeedback training: A novel approach toward training executive functions

Synchronous activity of two people's prefrontal cortices during a cooperative task measured by simultaneous near-infrared spectroscopy

Evaluation of a 2-Channel NIRS-Based Optical Brain Switch for Motor Disabilities' Communication Tools

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