Rats were allowed to consume either sucrose or saline prior to being made ill by injection of either insulin or formalin, or by exposure to X-rays. A 2bottle preference test between sucrose and saline revealed that formalin was an effective agent in conditioning aversions to sucrose but not to saline. Similarly, injections of insulin were found to be effective in producing conditioned aversions to saline but not to sucrose. X irradiation produced strong aversions to either solution. The results are discussed with regard to the specific need states that insulin and formalin produce.

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