The crossword puzzle paradigm: the effectiveness of different word fragments as cues for the retrieval of words.

We investigated the internal structure of words in the mental lexicon by using a crossword puzzle paradigm. In two experiments, subjects were presented with word fragments along with a semantic cue, and were asked to retrieve the whole word that contained the pre· sented fragment and was compatible with the semantic information. In Experiment 1, we found that any cluster of adjacent three letters facilitated retrieval better than dispersed letters. Moreover, syllabic clusters had greater facilitative effect than nonsyllabic pronounceable clusters, or nonpronounceable clusters. In Experiment 2, we found that syllabic units facilitated retrieval more than morphemic units. The results are interpreted as evidence for the existence of lexical sub· units that are larger than the letter but smaller than the word, and that are organized according to phonologic principles. An interactive model for solving crossword puzzles is propos ed.