Figure 1From: Thalamo-cortical mechanisms of the observed specific changes in frontal and occipital EEG rhythms during propofol-induce sedationSchematic of a thalamo-cortical module. The blue arrows indicate excitatory connections and the red arrows represent inhibitory connections. The symbols E, I, S and R denote the cortical excitatory and inhibitory neurons, thalamo-cortical relay, and thalamic reticular neurons, respectively. In addition the connections between cortex and thalamus are associated with the same time delay Ï„.Back to article page