In some of the experiments, the mice could drink their fill of either plain water or a flavoured solution; researchers measured the changing levels in water bottles to determine how sensitive the mice were to a particular taste. In other experiments, the mice had only a few seconds to drink while a machine counted how many times they licked the flavoured solution — a test that minimizes the influence of any after-effects that the mice feel upon drinking the test liquids.Both the normal and engineering mice showed the same flavour preferences in both types of experiment, indicating that they chose liquids on the basis of taste and not because of any after-effects of the flavour
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