Age-related Chinese word recognition across different AoA and parts of speech

The cognitive ability of older adults declines with age, while the language processing experience becomes more abundant. Word recognition is one of the most fundamental abilities in language processing, but how the interaction of cognitive aging and language experience affects word recognition in older adults is still a complex issue. This study focuses on the influence of two factors, age of acquisition (AoA) and parts of speech on Chinese word recognition in older adults. In Experiment 1, we employed a context-free lexical decisions task to compare the differences of word recognition between young and older adults at the conditions of different AoAs and parts of speech. In Experiment 2, participants were required to perform a sentence reading task in order to examine the above effects with contextual involvement, and their eye movements were tracked and analyzed. Combining the results of the two experiments, we found a greater AoA effect in older adults compared to young adults. This effect primarily manifested as a decline in processing efficiency for late-acquired words and was already evident in the early stage of word recognition. In addition, only the older adults exhibit differences in the processing of distinct word components, indicating a progressive pattern of increasing difficulty from nouns to verbs and subsequently to adjectives. The findings suggest that older adults experience a heightened exacerbation of word processing difficulties.