Thalamocortical model for a propofol-induced alpha rhythm associated with loss of consciousness

Abstract

Recent data reveal that the general anesthetic propofol gives rise to a frontal α-rhythm [alpha rhythm] at dose levels sufficient to induce loss of consciousness. In this work, a computational model is developed that suggests the network mechanisms responsible for such a rhythm. It is shown that propofol can alter the dynamics in thalamocortical loops, leading to persistent and synchronous α-activity [alpha activity]. The synchrony that forms in the cortex by virtue of the involvement of the thalamus may impede responsiveness to external stimuli, thus providing a correlate for the unconscious state.