Design of stimulation methods in SSVEP-based BCI using electroluminescence device

• Main Authors: KAO-MING KUO, 郭高銘
• Other Authors: Po-Lei Li
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/97425274896322669165

碩士 === 國立中央大學 === 電機工程研究所碩士在職專班 === 99 === Brain computer Interface (BCI) is the equipment that recognizes user’s electroencephalography (EEG) patterns to communicate external environments or control external devices. A BCI allows disabled people or paralyzed patients to transmit their intentions, independent of peripheral muscle activities, so as to improve their living qualities. In recent years, steady state visual evoked potential (SSVEP)-based BCI has drawn great attentions, due to its advantages of simple architecture, fast responding time, and high information transfer rate (ITR). SSVEP-based BCI encodes visual stimulators with distinct stimulation frequencies. Subjects’ gazed targets can be recognized through identifications of SSVEP patterns, and converted into control commands for different applications. The research proposes a novel design of stimulation method for SSVEP-based BCI using electroluminescence (EL) device. Unlike the point lighting source done by LED, it provides paper lighting source with wider visual angle so that subjects can easily focus their attentions and perceive with better visual comfortableness. In addition, the EL device is lighter, cheaper, and more power efficient than traditional BCI lighting sources, such as light-emitted diode (LED), liquid crystal display (LCD), and cathode ray tube (CRT), lighting source. The EL display equipped BCI is slimmer than general BCI. Without using backlights, the EL device requires only small amount of electric driving current, which is an important feature for reducing the power consumption and production cost as well as the portability.