Fig. 2. The effects of isoflurane on learning, memory, and pain sensitivity. (  A ) No significant effect on task acquisition was found. (  B ) A significant reduction in memory retention latency occurred with the 0.2% dose. A stronger amnesic effect was found with the 0.3% dose. (  C ) Analgesia was found at 0.2% and proportionally increased at 0.3%. The other details are as in  figure 1 . *  P < 0.05, ***  P < 0.001 compared with air controls. NS = not significant.