Rule Learning and Rule Interference in Trigram Encodings
The discovery and use of transformational rules as well as subsequent interference among such rules was investigated. 24 single-solution trigrams were permuted from their respective solution-words by a uniform letter-order rule (LOR) and assigned to one of 2 lists. LORs were either the same for both lists or different. Two control groups were included to assess the effects of practice on anagram solution and of prior rule-learning experience. Ss were simply asked to discover and say aloud the solution words. There was no suggestion that rules could be formulated. Comparisons among conditions using mean median solution time for successive blocks of list-items indicated that (a) practice has no effect on solution time with nonrule materials, (b) encoding rule learning does occur, and (c) when rules are changed (List I to List II) solution time increases significantly, i.e., encoding rule interference results.