The Study On Local Field Potentials Of Rats During Pressing Paddle

Brain-Computer Interface (BCI) is kind of technology that enables people to communicate with computer or to control devices and systems with brain signals, it supplies a new therapy for those paralysis patients. Since recording and extracting characteristic brain signals is the basic and significant requirement in the study of BCI, a system was established to study the characteristic brain signals of corresponding behavior based on animal experiments.In this study, we synchronously collect local field potentials using self-made multi-channel microelectrodes and Cerebus^TM 32 channels data acquisition system implanted in the forelimb region of the primary motor cortex, prefrontal cortex and ventrolateral thalamic nucleus in mature SD male rats. We record the rats' behavior at the same time, aiming at studying the local field potentials of the rats during pressing the paddle, which would be a basic research of BCI and cortex decoding.We establish the system of training rats to press the paddle for water, collect the brain signals through data acquisition system, record the video of rat's behaviors. We analyze the local field potentials of the cortex related to the forelimb of rats pressing the paddle, the temporal character, spectral character and time-frequency character of the local field potentials during pressing the paddle. We also analyze the gravity frequency and complexity, as well as the relationship of the cortex etc. According the temporal character, we use threshold and template matching method to recognize the brain signal of pressing paddle.Results indicate that: the local field potentials of rats during pressing paddle have their distinct characteristic on temporal mode, spatial mode and time-frequency mode. Compared with the drinking behavior, the gravity frequency and complexity of rats are quite different during pressing paddle. We have a good recognition of the brain signal of the pressing paddle using template matching method, the recognition rate can reach 80%.But telling the brain signal causing by pressing paddle from the brain signal causing by other movements look forward to the future work.