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Brain Computer Interface (BCI) is any system which can derive meaningful information directly from the user's brain activity in real time. Modern BCIs use information obtained from the user's encephalogram (EEG), though BCIs based on other brain imaging methods are theoretically possible. BCIs are currently an embryonic technology and do not have the speed, accuracy, or ease of use to replace conventional interfaces such as keyboards or mice. However, there are already several different BCI systems which can provide an alternate means of communication for disabled individuals who cannot communicate via other means. Many of these systems are being improved and will soon be of value to many different people in a wide variety of environments and situations.
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