Abstract
A method is described for eliminating the position habit which often arises in experiments designed to determine preference-aversion thresholds for water and a test fluid such as ethanol. A three bottle (i.e., three position) paradigm is employed, but only water and a test fluid are offered to the animal. The third bottle is empty but is rotated every day in a predetermined sequence along with the other two bottles. In preference determinations for different concentrations of ethanol, stable fluid intake functions are obtained.
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