A real time frequency analysis methodology for evoked potential loop-closure

摘要

Evoked EEG (electroencephalogram) response research indicates the potential for a usable brain-actuated control system (UBACS). Reduction of time lag is essential for the continued development of a subject-training system, which has yielded results, but has certain limitations in the areas of response time and false feedback due to artifacts. The authors are investigating a lock-in amplifier system (LAS) to overcome these limitations. Frequency and phase facile system capabilities as well as artifact rejection techniques for the LAS are considered. Improved LAS response time is projected. It is expected that this tool will enable effective training by continuously supplying subjects with an indication of their EEG output at a reference frequency. The experimental/prototype system is discussed.