Six groups of Ss were trained to guess whether or not a second light would be illuminated following the illumination of a first light. Two consistent groups, two 50% partial groups, and two patterns in sequence groups were employed. In one sequence group consistent training followed partial training and in the other the opposite sequence of patterns was employed. All groups received extinction training. It was found that the sequence groups differed from each other in extinction and from the consistent and partial control groups.
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