Abstract
The ability of rats to make intensity discriminations was determined by forming a conditioned taste aversion to a moderate concentration of each of four basic taste stimuli, and then measuring the level of acceptance (number of licks during a 15 sec exposure) shown to a range of concentrations of the same chemical. Rats (N=66) could discriminate between glucose concentrations that were separated by as little as 0.074 M, between NaCl concentrations that differed by 0.029 M, between HCl concentrations that were 9×10 −4 M apart, and between quinine HCl concentrations that differed by as little as 2.4×10 −6 M.
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