Age of Acquisition Effects on the decomposition of compound words
Age of acquisition (AoA) is a measure of learning experience and a strong predictor of lexical retrieval. According to the integrated view, the AoA effect results from the development of semantic representations and the mappings between these representations. This has not been considered in morphologically complex words. The integrated account predicts that the AoA effect should be larger in tasks requiring greater semantic processing and any AoA effects should be shown in the early processes of word recognition. The present study investigates these predictions in compound words, which differ from monomorphemic words in terms of ease of mapping and semantic processes in lexical retrieval. Forty-eight participants completed a compound lexeme segmentation (CLS) task, in which participants named either the head or modifier depending on the number above the compound word, to establish how semantics are involved in processing the head and the modifier. The results demonstrated that semantics influenced the naming of the modifier to a greater extent than the head, with the AoA effect being larger in the modifier than the head. Our findings provide evidence that aligns with the multiple origins of AoA effects in the language processing system.