Abstract
Fifteen common goldfish, divided among five groups, were trained to strike a key in response to a 555-nm wavelength. Four of the groups were given discrimination training with S either 501, 538, 576, or 606 nm (one group being assigned to each value). A control group was given single-stimulus training. Generalization tests with wavelengths in the range 501-606 nm yielded gradients with the mode at S+ for the control Ss. The postdiscrimination gradients of the four experimental groups showed a shift in the mode of responding from S+ in a direction away from S-, with the exception of one S. Also, mode shifts were inversely related to S+, S- separations, i. e., shifts were greater when S+ and S were closely separated on a continuum than when they were more widely separated. The majority of Ss in the discrimination groups showed positive behavioral contrast during their discrimination training phase.
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