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Document Type |
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Thesis |
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Document Title |
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DESIGN AND DEVELOPMENT OF FUNCTIONAL NEAR INFRARED SPECTROSCOPY SYSTEM FOR IDENTIFICATION OF HUMAN EMOTIONS تصميم وتطوير المنظومة الوظيفية القريبة من الأشعة تحت الحمراء لتحديد المشاعر البشرية |
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Subject |
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Faculty of Engineering |
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Document Language |
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Arabic |
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Abstract |
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Emotion is a mental state that is associated with thoughts, behavioral responses and degree of positive or negative feelings. It is spontaneously arising through conscious effort linked to physiological changes of the body. There is yet no scientific consensus on the definition but always play an important role in human life. Though the brain influences emotions and the mood, the psycho-physiological basis of the brain still remained poorly understood. The neurological scientists and researchers are working hard to unravel it functioning. Recognition of human emotions has potential applications ranging from the consumer market to healthcare. Recent year technological developments have spurred the research on emotion identification in different ways. Brain imaging technology is attractive to the researchers since it is noninvasive and that can detect the neural activity of the brain at higher specificity. Electroencephalography (EEG), functional magnetic resonance imaging (fMRI), positron emission tomography (PET) and computed tomography (CT) techniques are used today for neuroscience-related studies. These are accepted methods in the detection of emotions. More recently, functional near-infrared spectroscopy (fNIRS) has emerged as a new technique that can potentially measure the neural responses produced from brain activity. Functional Near-infrared spectroscopy is based on an optical method that is emerging as a promising tool in the cognitive neurosciences, neuropathology and psychological studies. This technique can measure the changes in oxygenated and deoxygenated haemoglobin concentrations related to neuronal activation of the brain. In this study, we have conducted experiments on volunteers to recognize their emotions from fNIRS. We have measured the cerebral hemodynamic responses while they were watching a video clip. The measurements were carried out from commercial fNIRS equipment (LABNIRS, SHIMADZU, Corp.). The data was then analyzed by a linear model method in making an assessment of emotion that was produced deliberately from brain activation.
We have also designed and developed a portable and low-cost NIRS system by using 760/840 nm wavelength light emitting diodes (LED) and photodiodes. A headband was designed for holding 12 LEDs and 4 photodiodes such that the near infrared light can penetrate deep up to the cortex and the backscattered light is collected from the photodiodes. Each light source emitting at two dual wavelengths is made to remain on sequentially for a short duration. The controlling of the components and interfacing with the computer were achieved by two Arduino boards in the system. The system was evaluated by phantom experiment and assessed for future study in brain imaging.
Key words: fNIRS, brain activity, Emotion, hemoglobin, brain imaging. |
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Supervisor |
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Dr. Prahlad Rao Kalyanrao |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1440 AH
2019 AD |
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Co-Supervisor |
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Dr. Naif Daefalla Alotaibi |
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Added Date |
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Monday, August 26, 2019 |
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Researchers
| ندر صالح العنزي | Alenzi, Nadr Saleh | Researcher | Master | |
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