Limited evidence of morphology in semantic and phonological free association tasks

Free association (e.g., what is the first word that comes to mind when given a cue word) can reveal multiple linguistic relationships between cues and responses, even when a specific association (i.e., semantic, phonological) is intended. In this study, we investigated the influence of morphological similarity on semantic and phonological free association. Previously collected large datasets were used to evaluate morphological similarity between cues and responses in a semantic association task and a phonological association task. The results indicate that morphologically related cue–response word pairs comprised less than 2% of pairs in both association tasks. When morphologically related responses were detected in both tasks, we found more words that were non-compounds than compounds, more decomposition than composition and more suffixation than prefixation. There were task-specific differences in the psycholinguistic properties of cue words eliciting morphologically related responses. We interpret the results following a two-stage lexical model, where free association primarily involves the exploration of conceptual/lemma representations in the mental lexicon, as opposed to form/lexeme representations.