Despite the lack of significance between the Category Label and Response Location costs based on the first 50 post-change trials, there is a clear trend toward a larger cost in the Category Label condition (.084) relative to the Response Location condition (.049), and toward a larger cost in the Response Location condition relative to the Control condition (.010).
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The sentences
Most importantly, the magnitude of the cost was larger (significant based on the first 100 post-change trials and showing a strong trend based on the first 50 post-change trials) when the stimulus-to-category label association was broken than when the category label-to-response location association was broken.
The most important finding is that we observed a larger cost in the Category Label condition than in the Response Location condition, and in this case, the difference was highly significant for both the 50- and 100-trial analyses.