Abstract: “Brain Computing Interface (BCI) provides the direct link between brain and computer device. People do not need any muscle movement. Brain states can be detected and translated into actions. Two basic requirements of brain and computing interface are the features useful to distinguish several kinds of brain states and methods for classification of signals.BCI have three types: invasive, partially invasive and noninvasive BCI, but non invasive is a safe technique.EEG is the most popular non invasive technique. After acquisition of signals, the feature extraction and classification methods are performed. These methods will play the main role in BCI system's output. If the misclassification is performed, then the error or wrong command will generate. Currently we have so many methods available for the classification like Linear discriminate analysis (LDA), Support vector machine (SVM), multiple layer perception (MLP), bayes quaderatic etc. but there are many challenges and issues in BCIs.”

Keywords: interface, investigation