A 2-choice concept discrimination task provided Ss with varying amounts (0% to 50%) of positive and/or negative feedback or no feedback as to correctness or incorrectness of response. In addition Ss were given either explicit instructions advising them about the no-feedback condition or were given standard instructions without such a warning. No feedback constituted being told neither “right” nor “wrong” to a response. The intent was to prevent S from assuming that no feedback meant either right or wrong, to provide for direct comparison of the effectiveness of Right vs Wrong as feedback sources, and to select the most appropriate of several explanatory models. Results generally favored an extended version of Buchwald's meaning induction hypothesis, and with control over the meaning-induction process positive and negative feedback were interpreted to be equivalent in effectiveness.
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