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The paper examined response of brain wave to mental task and acoustic stimuli in order to evaluate stress effects of mental work and acoustic environment on brain electrical activity. The amplitude of the alpha wave (8-13 Hz), which is the representative component of awake brain wave, was decreased by approximately 15~20 % during performing the mental task (mental arithmetic and memorization) alone...
Thermal imaging techniques have been applied to detect and measure mental stress in polygraph screening and other applications. Mental stress is highly correlated with the activation of the corrugator muscle on the forehead. The vessels that supply blood to the corrugator muscle, proportionally to its degree of activation, are the supraorbital vessels. The rate of blood flow in these vessels can be...
Ubiquitous healthcare system should be well designed without disturbing the user feeling during operation. The system requires reliability and easy measurement for daily use, which is particularly essential for an ubiquitous healthcare device. In this paper, biofeedback chair for mental stress condition was designed using heart rate variability (HRV). Our designed prototype was equipped with one channel...
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