A5059160893- EEG and Brain-Computer Interfaces
- Functional Brain Connectivity Studies
- Neuroscience and Neural Engineering
- Neural dynamics and brain function
- Muscle activation and electromyography studies
- Transcranial Magnetic Stimulation Studies
- Stroke Rehabilitation and Recovery
- Action Observation and Synchronization
- Motor Control and Adaptation
- Visual perception and processing mechanisms
- Advanced Memory and Neural Computing
- Virtual Reality Applications and Impacts
- Autism Spectrum Disorder Research
- Dysphagia Assessment and Management
- Cognitive Abilities and Testing
- Fractal and DNA sequence analysis
- Vestibular and auditory disorders
- Gaze Tracking and Assistive Technology
- Genetics and Neurodevelopmental Disorders
- Spatial Neglect and Hemispheric Dysfunction
- Nonlinear Dynamics and Pattern Formation
- Behavioral and Psychological Studies
- Nerve injury and regeneration
- Child Nutrition and Feeding Issues
- Memory and Neural Mechanisms
Oita University
2016-2024
Osaka University
2010-2018
RMIT University
2009
Abstract Neuroprosthetic arms might potentially restore motor functions for severely paralysed patients. Invasive measurements of cortical currents using electrocorticography have been widely used neuroprosthetic control. Moreover, magnetoencephalography (MEG) exhibits characteristic brain signals similar to those invasively measured signals. However, it remains unclear whether non-invasively convey enough information control a hand, especially patients whose sensorimotor cortex be...
The aim of this study was to investigate the differential time-course responses auditory cortex repeated stimuli in children with autism spectrum disorder (ASD) showing hypersensitivity. Auditory-evoked field values were obtained from 21 boys ASD (12 and 9 without hypersensitivity) 15 age-matched typically developing controls. M50 dipole moments significantly increased during only hypersensitivity compared those for other two groups. having also showed more prolonged response duration than...
Brain-machine interfaces (BMIs) are promising devices that can be used as neuroprostheses by severely disabled individuals. Brain surface electroencephalograms (electrocorticograms, ECoGs) provide input signals then decoded to enable communication with others and control intelligent prostheses home electronics. However, conventional systems use wired ECoG recordings. Therefore, the development of wireless for clinical BMIs is a major goal in field. We developed fully implantable signal...
It has been suggested that resting-state functional connectivity (rs-FC) between the primary motor area (M1) region of brain and other regions may be a predictor learning, although this suggestion is still controversial. In work reported here, we investigated relationship M1 seed-based rs-FC learning. Fifty-three healthy volunteers undertook random button-press sequential learning tasks. Five-minute data acquisition was performed two Oscillatory neural activities during task rest period were...
Purpose: Noninvasive localization of certain brain functions may be mapped on a millimetre level. However, the interelectrode spacing common clinical surface electrodes still remains around 10 mm. Here, we present details development for attaining higher quality electrocorticographic signals use in functional mapping and brain-machine interface (BMI) technologies. Methods: We used platinum-plate-electrodes 1-mm diameter to produce sheet after creation individualized molds using 3-D printer...
High gamma band (>50 Hz) activity is a key oscillatory phenomenon of brain activation. However, there has not been non-invasive method established to detect language-related high activity. We used 160-channel whole-head magnetoencephalography (MEG) system equipped with superconducting quantum interference device (SQUID) gradiometers non-invasively investigate neuromagnetic activities during silent reading and verb generation tasks in 15 healthy participants. Individual data were divided into...
Brain signals recorded from the primary motor cortex (M1) are known to serve a significant role in coding information brain-machine interfaces (BMIs) need perform real and imagined movements, also form several functional networks with association areas. However, whether between M1 other brain regions, such as these areas, related performance of BMIs is unclear. To examine relationship connectivity BMIs, we analyzed correlation coefficient neural decoding over whole using...
The relationship between M1 activity representing motor information in real and imagined movements have not been investigated with high spatiotemporal resolution using non-invasive measurements. We examined the similarities differences during movements. Ten subjects performed or three types of right upper limb To infer movement type, we used 40 virtual channels contralateral to side (cM1) a beamforming approach. For both movements, cM1 activities increased around response onset, after which...
Abstract Introduction It has been suggested that transcranial alternating current stimulation (tACS) at both alpha and beta frequencies promotes motor function as well learning. However, limited information exists on the aftereffects of tACS learning neurophysiological profiles such entrainment neural plasticity in parallel. Therefore, present study, we examined effect using an off‐line condition. Methods Thirty‐three healthy participants were randomly assigned to 10 Hz, 20 or sham group....
Although abnormal auditory sensitivity is the most common sensory impairment associated with autism spectrum disorder (ASD), neurophysiological mechanisms remain unknown. In previous studies, we reported that this in patients ASD delayed and prolonged responses cortex. present study, investigated alterations residual M100 MMFs children who experience sensitivity. We used magnetoencephalography (MEG) to measure MMF elicited by an oddball paradigm (standard tones: 300 Hz, deviant 700 Hz) 20...
Abstract Introduction Identification of language‐related cortical functions can be carried out noninvasively by transcranial magnetic stimulation ( TMS ) and magnetoencephalography MEG ), which allow for lesion‐based interrogation global temporospatial investigation cortices, respectively. Combining these two modalities improve the accuracy identification, but relationships between them remain unclear. We compared responses during same language task to elucidate their used results develop a...
Abstract Objectives During the anticipatory stage of swallowing, sensory stimuli related to food play an important role in behavioral and neurophysiological aspects swallowing. However, few studies have focused on relationship between preferences oscillatory brain activity during Therefore, clarify effect individual activity, we investigated observation images. Methods Here examined this using visual electroencephalography (EEG). Nineteen healthy participants were presented 150 images a...
In order to clarify whether neurophysiological profiles affect the performance of brain machine interfaces (BMI), we examined relationships between amplitudes movement-related cortical fields (MRCFs) and decoding performances during movement. Neuromagnetic activities were recorded in nine healthy participants three types unilateral upper limb movements. The movement inferred by a support vector machine. amplitude MRCF components, motor field (MF), movement-evoked I (MEFI), II (MEFII)...
The P300-based brain-computer interface (P300-BCI) is expected to provide a new communication tool for patients with amyotrophic lateral sclerosis (ALS). Currently, there little evidence about the relationship between neurophysiological profiles of P300 and performance P300-BCI in ALS. In present study, we investigate this detail. Patients were asked input five characters using traditional row/column speller which consisted 7 × 10 matrix. EEGs recorded eight electrodes. on-line was then...
Spatiotemporal signal transmission in the human subcortical visual pathway has not been directly demonstrated to date. To delineate this noninvasively, we investigated early latency components between 45 ms (P45m) and 75 (N75m) of visually-evoked neuromagnetic fields (VEFs). Four healthy volunteers participated study. Hemi-visual field light flash stimuli were delivered a total 1200 times. Neuromagnetic responses measured with 160-channel whole-head gradiometer. In three participants,...
Abstract Background Skill acquisition of motor learning between virtual environments (VEs) and real (REs) may be related. Although studies have previously examined the transfer in VEs REs through same tasks, only a small number focused on studying by using different tasks. Thus, detailed effects skills remain controversial. Here, we investigated sequential conditions. Methods Twenty-seven healthy volunteers performed two types tasks; visually cued button-press task RE (RE task) reaching VE...
In this study, we aimed to identify the cerebellum-related electromyographic (EMG) response that appeared in upper limbs musculature. Thirty times averaged transcranial magnetic stimulation (TMS) with a double-cone coil placed over cerebellar hemisphere elicited long latency EMG responses at bilateral extensor carpi radialis (ECR) muscles. The peak of was 70.7±12.7 ms ipsilateral ECR and 62.9±10.2 contralateral TMS side. These latencies were much longer than muscle evoked potential when...
Imitation is a complex process that includes higher-order cognitive and motor function. This requires an observation-execution matching system transforms observed action into identical movement. Although the low-gamma band thought to reflect higher processes, no studies have focused on it. Here, we used magnetoencephalography (MEG) examine neural oscillatory changes including during imitation. Twelve healthy, right-handed participants performed finger task consisting of four conditions...