1. A method of decoding neural activity for a brain computer interface (BCI) system, comprising the steps of: recording noninvasively acquired electroencephalography (EEG) signals of a subject in a time domain when the subject observes movement of a stimulus while the subject is simultaneously imagining movement of a limb tracking the movement of the stimulus; continuously decoding only the recorded EEG signals having a frequency of less than 4 Hz and in the time domain associated with the observed movement and the imagined movement; and correlating fluctuations in amplitude of the decoded recorded EEG signals with an intent of the subject.