Abstract
The present study examined the dose related effects of low levels of the toxin, LiCl, on the ingestion of a palatable sucrose plus salt solution. Over five days (acquisition phase) rats were presented with a 0.3M sucrose solution containing one of the following salt combinations: 0.12M NaCl (n=10 negative control group); 0.005M LiCl+0.115 NaCl (n=10); 0.01M LiCl+0.11 NaCl (n=10); 0.015M LiCl+0.105M NaCl (n=10); 0.02M LiCl+0.10M NaCl (n=10); and 0.12M LiCl (n=8 positive control group). During an extinction phase (5 days), all rats were presented with 0.3M Sucrose+0.12M NaCl solution. Fluid intake levels and number of licks were quantified on each day. At low LiCl concentration levels rats exhibited a dose related reduction in amount consumed and number of licks of the sucrose plus salt solutions. This toxin related suppression of fluid intake and licking rapidly dissipated during the extinction phase. The present findings support the hypothesis that rats use a behavioral tolerance mechanism to regulate their intake of foods containing low levels of toxins.
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