Fig. 4.
Probability distribution of unique spike patterns prestimulus and poststimulus at four levels of desflurane anesthesia (8, 4, 6, and 2%) and wakefulness (0%). Spike patterns are sorted in descending order (left to right) as a function of their frequency of occurrence. The number of no-spike patterns was omitted. Flash stimulus increases the prevalence of frequent spike patterns—an effect that dominates in deep anesthesia but absent in wakefulness. The last panel (lower right) illustrates the change in prestimulus pattern distributions. Poststimulus distributions are virtually unchanged. Post = poststimulus; Pre = prestimulus.