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Brain-computer interface (BCI) is combination of hardware and software systems that allows the severely or partially disabled persons to communicate with their surroundings. The study of brain activities precisely is an important step in BCI system. Many invasive and non-invasive neuro-imaging techniques are being conducted. In this paper, a comparative analysis of these different approaches has been reviewed such as electroencephalography (EEG), electro-corticograph (ECoG),doi:10.14257/ijbsbt.2015.7.4.21 fatcat:5whgvcsu6baqbp5obqfzuraq2y