Free Moving Rat's EEG Analysis And Recognition For Brian Comupter Interface

Brain-computer interface, which focuses on recognizing the features of cognition and generating command signals for the prosthesis under the control of a computer, has become the focal interdisciplinary research of neuroscience and information engineering technique. In the study of BCI, Extracting characteristic brain signals is the basic and significant requirement. So a system was established to record the EEG and behavior synchronously by utilizing electrophysiology and ethology technique.The research system consists of two aspects: The behaviors of free moving rats were recorded and analyzed by a behavior analysis system which developed by our lab;EEG of deep brain and neuron action potentials were collected and recognized by Cerebus 32-Channel Data Acquisition System. In order to study the function of hippocampus and Nucleus accumbens in regulating feeding behavior the multi-channel microelectrode made by ourselves was implanted in these two brain regions. Then the EEG signals and video images were recorded and analyzed by the system. Results indicate that: when the rat was feeding the EEG of deep Nucleus accumbens appeared apparently characteristic rhythm;the neurons in hippocampus fired in a dense pattern. All of these work imply that the method and system can been applied into BCI researches.