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Hydrogels are ideal building blocks to fabricate the next generation of electrodes for acquiring high‐quality physiological electrical signals, for example, electroencephalography (EEG). However, collection of EEG signals still suffers from electrode deformation, sweating, extensive body motion and vibration, and environmental interference. Herein, polyvinyl alcohol and polyvinylpyrrolidone are selected...
A convenient way for controlling household appliances using a remote controller is not suitable for movement-disabled patients. To provide an alternative for such people, some applications on controlling household devices have been developed recently. However, there are some shortcomings in those control systems. Because the brain activities are reserved in movement-disabled patients, we proposed...
P300-speller which relies on P300-event related potential (ERP) is an important application of the BCI system. However, the accuracy and information transmission rate were relatively low for practical use. To solve the problem, researchers focused on two aspects of paradigms and classifiers. P300-speller with familiar face paradigm achieved a better performance. In addition, Bayesian linear discriminate...
Many studies have shown that temporal asynchrony of visual-auditory stimuli can influence the integration between visual and auditory modality, however, the multisensory mechanisms of asynchronous inputs were not well understood. To investigate the effect of temporal asynchrony on audiovisual integration, we measured event-related potentials (ERPs) and behavior in human subjects. In this study, visual...
P300-speller is a communication system based on brain-computer interface (BCI) which allows users to input characters by focused attention. Support vector machine (SVM) ensemble has been successfully applied to classify in the P300-speller. However, large scale of training data was needed for the sub-classifiers to ensure the performance of classification. Subjects gradually got fatigue during the...
Nowadays, P300-speller has become the most popular Brain-computer interface (BCI) which can provide a new communication path between patients suffered amyotrophic lateral sclerosis (ALS) and the outside world. Many efforts have been done to improve the speed and accuracy of the P300-speller. Recently, some researchers improve the performance of the P300-speller through replacing the flashing rows...
P300-speller is a communication style based on Brain-computer interface (BCI) which allows users to input characters by electroencephalography (EEG) signals. In the past few years, there are various studies on P300-speller paradigm and classification algorithm. However, the accuracy and bit rates are not yet satisfied for our daily life. In order to improve the performance of the P300-speller, we...
In this paper, we present a selection method of electroencephalography (EEG) channels for a brain-computer interface (BCI) experiment used to control walking behaviors of a humanoid robot via human mental activities. The goal of this study is to decrease the data dimension of the sampled neural signals via selecting the suitable EEG channels. We used coefficient of determination as an index to evaluate...
In this paper, we present a non-intrusive lie detection system based on thermal imaging technologies. The system consists of the following modules: thermal camera, face detection and tracking, face landmark detection, feature extraction, and pattern recognition for concealed knowledge inference. We have discovered the most sensitive areas on the human face to monitor facial temperature changes. Detection...
Two experiments were conducted to explore the different effects of visual/auditory attention on bisensory audiovisual integration using behavioral and electrophysiological measures. Subjects were asked to attend visual stimulus in experiment1, but to attend auditory stimulus in experiment2. In each experiment, unisensory visual, unisensory auditory, and bisensory audiovisual stimuli were presented...
The clinical diagnosis can detect the presence of brain disease once significant neuronal disruption has occurred. Early clinical detection of neuropsychological disorder lacks the unification standards. The aim of this study was to describe the neural mechanism of audiovisual interaction in healthy subjects by combining behavior-based methods (neuropsychological testing) and event-related potentials...
We applied behavioral and event-related potential (ERP) measures to study the multisensory interactions of audiovisual stimuli presented at different locations in an auditory-attention task in which an irrelevant visual stimulus occasionally accompanied the auditory stimulus. A stream of visual (V), auditory (A), spatially congruent audiovisual (AVCon), and spatially incongruent audiovisual (AVInc)...
The influence of spatial congruency on audiovisual interaction in a visual-attention task in which only the visual segment of a bimodal audiovisual stimulus was required to attend was investigated using behavioral and electrophysiological measures in humans. The behavioral results showed that the responses to audiovisual target stimuli were faster than that to unimodal visual target stimuli. Moreover,...
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