![]() ![]() ![]() Patients do not learn new information or even new associations between already familiar information. Therefore, some memory function persists during clinically adequate anesthesia. Their finding suggests that a sudden decrease in perceptual priming occurs when anesthetic depth decreases below BIS of 40, but until then, it is unaffected by the transition from consciousness to unconsciousness. Their inclusion of a group of awake participants is interesting because it raises the question of whether priming during anesthesia is a mere shadow of priming activity in the conscious brain or whether perceptual priming is insensitive to all but the most extreme manipulations of brain function. found as much memory for words presented during anesthetic depths of BIS 41–60 as for words presented to volunteers receiving no anesthesia (and no surgery). Using a measure specifically of implicit memory, Iselin-Chaves et al. However, the measure of memory used in this analysis included explicit as well as implicit components. 4found a significant although not very strong linear relation between memory and anesthetic depth at which words were presented. 1,4The exact relation between priming and depth is not clear. It is more likely to occur with opiate-based techniques than with volatile anesthetics that produce deeper hypnosis, 8and it does not occur when BIS is less than 40. It is generally true, though, that memory activation is more likely with lighter anesthesia. ![]()
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