The mice were raised individually before the experiment. During the training period, 2 bottles of 1% (w/v) sucrose solution were placed in the squirrel cage for 24 h. After that, one of the bottles was changed to pure water, and after 12 h of adaptation, the position of sucrose water and pure water were changed to continue to adapt for 12 h. After the mice were deprived of water and food for 24 h, 1 bottle of water and 1 bottle of 1% (w/v) sucrose solution were placed in cages with free access. 24 h later, the remaining amounts of sucrose and water were determined. The sucrose preference (%) was determined using: sucrose preference (%) = sucrose consumption/(water consumption + sucrose consumption) × 100%.

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