Abstract
Effects of administration of cupric chloride on the taste preference for the four basic taste solutions were studied by means of two bottle preference tests in rats. The intraperitoneal injection of 450 μg CuCl 2/100 g B.W./day for 2 weeks induced no significant changes in the taste preference for both NaCl and sucrose solutions. On the other hand, the taste preference for tartaric acid and quinine-HCl solutions was influenced by CuCl 2 injection; 10 out of 27 rats took tartaric acid or quinine solutions as much as water, and 4 out of 27 rats showed a marked increase in fluid intake for tartaric acid or quinine solutions over water. Discontinuation of copper administration restored the altered preference responses to the preference level seen in the control period. Patterns of the summated taste nerve response to various concentrations of the four basic taste stimuli in the copper-injected rats were similar to those in the control rats. The possible mechanisms by which copper injection alters preference behavior are discussed.
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