Two experiments investigated how well bilinguals utilise long-standing semantic associations to encode and retrieve semantic clusters in verbal episodic memory. In Experiment 1, Spanish-English bilinguals (N = 128) studied and recalled word and picture sets. Word recall was equivalent in L1 and L2, picture recall was better in L1 than in L2, and the picture superiority effect was stronger in L1 than in L2. Semantic clustering in word and picture recall was equivalent in L1 and L2. In Experiment 2, Spanish-English bilinguals (N = 128) and English-speaking monolinguals (N = 128) studied and recalled word sequences that contained semantically related pairs. Data were analyzed using a multinomial processing tree approach, the pair-clustering model. Cluster formation was more likely for semantically organised than for randomly ordered word sequences. Probabilities of cluster formation, cluster retrieval, and retrieval of unclustered items did not differ across languages or language groups. Language proficiency has little if any impact on the utilisation of long-standing semantic associations, which are language-general.

Under a recall model in which presentations and rehearsals are treated as equivalent encoding events, we investigated whether rehearsal efficiency differences explain the effects of word frequency and bilingual proficiency on the temporal dynamics of rehearsal and free recall. Experiments 1 and 3 were conducted with monolingual English speakers, and Experiments 2 and 4 were conducted with Spanish-English bilinguals with matched age, education, and socioeconomic status. In Experiments 1 and 2, lower word frequency, lower proficiency, and bilingualism were associated with less accurate free recall of items from early serial positions, beginning recall with items from later serial positions, and making fewer transitions to items from later or adjacent serial positions. These effects were replicated and rehearsal-based explanations were validated in Experiments 3 and 4 using a rehearse-aloud protocol. With lower frequency words or lower language proficiency, rehearsal was less efficient with fewer rehearsals between item presentations. As a result, items from early serial positions had fewer rehearsals that stopped earlier in the study sequence, less spacing between repeated rehearsals, and fewer transitions to items from later or adjacent serial positions. Rehearsal-contingent analyses revealed that these rehearsal patterns were associated with less accurate recall, beginning recall with items from later serial positions, and consistent transition patterns from rehearsal to recall. These patterns support a model in which presentations and rehearsals are treated as equivalent encoding events and the effects of word frequency and language proficiency on recall accuracy are mediated by less efficient rehearsal.