Ss were given 3 guided training (T) trials, each followed by a free response, to learn to move a concealed lever 60°. No KR was administered. Six unguided countertraining (CT) trials followed, during which KR related to a target 20° above the origin was administered after each free response. A unit error of 2° was reported as 1, 10, 100, or 1000 units, depending upon the group. In the first post-KR trial and over all CT trials, no significant differences among the groups were observed. The Groups X Trials interaction was likewise non-significant. It was concluded that inflating error by “adding zeroes” was a very weak manipulation in this situation.
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