A neuron population model for event-related desynchronization and synchronization
脑电事件相关去同步化和同步化的神经元群模型

A neuron population model based on thalamo-cortical network was used to study the brain connectivity with certain mental tasks. It consisted of three modules corresponding to cortex regions under EEG electrodes C3, Cz and C4. Its external inputs included the sensory inputs from the ascending afferents expressed with Gaussian white noise, the corticothalamic excitatory input expressed with a DC offset and the modulating input from brainstem and forebrain basilar neurons expressed with attenuating exponent. Its output average membrane potential in the excitatory population standed for the local field potential recorded in scalp EEG. Many trials had been made with various inputs and the model was analyzed with linear and nonlinear measurements. The results indicate that the alpha frequency band spectrum of output shows event-related desynchronization and synchronization (ERD and ERS), which is consistent with the brain computer interface experiment. The similar functional regions have more inhibitory connection and the dependency between the time series increase with coupling strength.