Could you tell me the number for ? sack zopiclone dosage 3.75 mg apartment mow When the rat is done licking, it has been conditioned to press one of two levers, depending on how it perceived the taste, or the quality of the taste. Pressing the right lever says, "I am familiar with this taste," while pressing the left lever says, "This taste is foreign to me." If the rat was testing an artificial sweetener, it should press the right lever and identify the taste as similar to natural sugar.