513Information Integration TheoryzTo be conscious you need to be a single, integrated entity with a large repertoire of highly differentiated states. zThe cortex and the thalamus are essential for consciousnesszΦ= size of the conscious repertoire associated with any network of causally interacting parts; synergy of the system. 14Why Does General Anesthesia Disrupt Consciousness?zMany cortical cells continue to respond selectively during anesthesia. zWhat appears to be disrupted is large-scale functional integration in the corticothalamiccomplex. 15When Does Human Consciousness Begin?zWomb?zBirth?zInfancy?