. CONTROL: Band Location The final part consists of applying [Hz] [_V] the will of the user to the used application. Alpha 8-12 10 -150 Occipital/ The user chooses an action by controlling Parietal (_) his brain activity, which is then detected regions 9-11 varies Precentral/ and classified to corresponding action. Feedback is provided to user by regions Beta 14 -30 25 typically visual means e.g. when typing with virtual (_) frontal keyboard, letter appears to the message regions 4-7 varies varies Theta box etc. (_) TRAINING: Delta <3 varies varies (_) The training is the part where the user to the BCI system. This adapts DETECTION: training begins with very simple exercises The detection of the input from the user where the user is familiarized with mental and them translating it into an action could activity which is used to relay the be considered as key part of any BCI information to the computer. Motivation, system. This detection means to try to find frustration, fatigue, etc. apply also here out these mental tasks from the EEG and their effect should be taken into signal. It can be done in time-domain, e.g. consideration when planning the training by comparing amplitudes of the EEG and procedures. in frequency-domain. This involves BIO FEEDBACK: usually digital signal processing for The definition of the biofeedback sampling and band pass filtering the is biological information which is returned signal, then calculating these time -or to the source that created it, so that source frequency domain features and then can understand it and have control over it. classifying them. These classification This biofeedback in BCI systems is algorithms include simple comparison of usually provided by visually, e.g. the user amplitudes linear and non-linear equations sees cursor moving up or down or letter and artificial neural networks. By constant being selected from the alphabet. feedback from user to the system and vice versa, both partners gradually learn more from each other and improve the overall A boon to the paralyzed -Brain Gate performance. Neural Interface System
. Band [Hz] [_V] Location Alpha (_) 8-12 10 -150 Occipital/ Parietal regions 9-11 varies Precentral/ regions Beta (_) 14 -30 25 typically frontal regions Theta (_) 4-7 varies varies Delta (_) <3 varies varies DETECTION: The detection of the input from the user and them translating it into an action could be considered as key part of any BCI system. This detection means to try to find out these mental tasks from the EEG signal. It can be done in time-domain, e.g. by comparing amplitudes of the EEG and in frequency-domain. This involves usually digital signal processing for sampling and band pass filtering the signal, then calculating these time -or frequency domain features and then classifying them. These classification algorithms include simple comparison of amplitudes linear and non-linear equations and artificial neural networks. By constant feedback from user to the system and vice versa, both partners gradually learn more from each other and improve the overall performance. CONTROL: The final part consists of applying the will of the user to the used application. The user chooses an action by controlling his brain activity, which is then detected and classified to corresponding action. Feedback is provided to user by means e.g. when typing with virtual keyboard, letter appears to the message box etc. TRAINING: The training is the part where the user adapts to the BCI system. This training begins with very simple exercises where the user is familiarized with mental activity which is used to relay the information to the computer. Motivation, frustration, fatigue, etc. apply also here and their effect should be taken into consideration when planning the training procedures. BIO FEEDBACK: The definition of the biofeedback is biological information which is returned to the source that created it, so that source can understand it and have control over it. This biofeedback in BCI systems is usually provided by visually, e.g. the user sees cursor moving up or down or letter being selected from the alphabet. A boon to the paralyzed -Brain Gate Neural Interface System visual
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