Goldfish studied in a choice situation showed progressive improvement in red-green discrimination reversal under a variety of training conditions, the amount of improvement varying with conditions. Of the several modifications of an earlier training situation which were introduced, exposing the animals to S+ during reinforcement had the greatest facilitating effect on performance. The use of a center key, response to which was required for presentation of the discriminanda, also produced substantial facilitation. On the other hand, feeding the animals at the locus of response was of relatively minor importance, and increasing the duration of unreinforced exposure to S-had no effect. Some questions about the relation between improvement in goldfish and improvement in more advanced animals are considered.
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