A Wireless Collector for EEG Signal of Freely Behaving White Mice

Study EEG signal is an approach to understand the relationship between neurons electron activities and animal's physiological and psychological state. A wireless EEG signal collector is designed in this paper. The collector contains microelectrodes set, front circuit, low-pass filter circuit, data collecting and transmitting circuit, and power supply circuit. When the two microelectrodes are pushed by propeller and inserted into the brain of white mice and the EEG signal is detected. It is amplified more than 10 thousands times by two level amplifiers and filtered by a HP filter and a LP filter to remove DC and high frequency interfere. Then the strong EEG signal is converted to digtal data and transmitted to host computer. The collector is wireless and miniature and the animal can behave freely. It has been used in our EEG signal acquisition system and shown good performance in carrying and communicating. It also can be used to acquire other animal's EEG signal.