Clustering and switching are hypothesised to reflect the automatic and controlled components in category fluency, respectively, but how they are associated with cognitive functions has not been fully elucidated, due to several uncertainties. (1) The conventional scoring method that segregates responses by semantic categories could not optimally dissociate the automatic and controlled components. (2) The temporal structure of individual responses, as characterised by mean retrieval time (MRT) and mean switching time (MST), has seldom been analysed alongside the more well-studied variables, cluster size (CS) and number of switches (NS). (3) Most studies examined only one to a few semantic categories, raising concerns of generalisability. This study built upon a distance-based automatic clustering procedure, referred to as temporal–semantic distance procedure, to thoroughly characterise the category fluency performance. Linear mixed-effects (LME) modelling was applied to re-examine the differential associations of clustering and switching with cognitive functions with a sample of 80 university students. Our results revealed that although lexical retrieval speed (LRS) is clearly the determining factor for effective clustering and switching, matrix reasoning and processing speed also have significant roles to play, possibly in the processes of identifying and validating the semantic relationships. Interestingly, total fluency score was accurately predicted by the four clustering/switching indices alone; including the cognitive variables did not significantly improve the prediction. These findings underline the importance of the clustering and switching indices in explaining the category fluency performance and the cognitive demands in category fluency.

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Aims and Objectives: Bilinguals reportedly perform better in tasks that require the suppression of interference because of the constant practice in linguistic inhibition. However, previous literature was largely based on comparisons of pure monolinguals and balanced bilinguals. Those in between the two extremes were rarely examined. This project aimed at studying whether the population who primarily speak in a first language with a different level of second language proficiency also enjoy bilingual advantage. Methodology: Twelve monolingual and 38 bilingual Hong Kong older adults were recruited to perform the Stroop task and the second language (English) proficiency tests. The subjects were all frequent first language (Cantonese) speakers with various levels of second language proficiency. Data and Analysis: Pearson correlation and multiple regression analyses were used to identify the relationship between inhibition ability (Stroop score) and demographic and language background variables (including proficiency in and frequency of exposure to their second language). Findings: Both correlation and multiple regression analysis showed that the subjects with higher proficiency in a second language performed significantly better in the Stroop task. The results suggested that higher second language proficiency leads to higher difficulty in suppressing it, thus the training of inhibition is more effective. Originality: This study expanded the literature on bilingual advantage from a dichotomous comparison between monolingual and bilingual to the more continuous spectrum of bilinguals with different levels of second language proficiency. This study aimed at showing a fuller picture of bilingualism in the world. Significance/Implications: This study proposed that with high proficiency in a second language, frequent first language speakers could also enjoy cognitive advantages brought by bilingualism. Our study provides further evidence for the bilingual advantage hypothesis.

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In recent years, foreign language learning (FLL) has been proposed as a possible cognitive intervention for older adults. However, the brain network and cognitive functions underlying FLL has remained largely unconfirmed in older adults. In particular, older and younger adults have markedly different cognitive profile—while older adults tend to exhibit decline in most cognitive domains, their semantic memory usually remains intact. As such, older adults may engage the semantic functions to a larger extent than the other cognitive functions traditionally considered the most important (e.g., working memory capacity and phonological awareness). Using anatomical measurements and a cognitive test battery, the present study examined this hypothesis in twenty cognitively normal older adults (58–69 years old), who participated in a two-month Italian learning programme. Results showed that the immediate learning success and long-term retention of Italian vocabularies were most consistently predicted by the anatomical measures of the left pars orbitalis and left caudal middle frontal cortex, which are implicated in semantic and episodic memory functions. Convergent evidence was also found based on the pattern of cognitive associations. Our results are consistent with a prominent role of semantic and episodic memory functions in vocabulary learning in older learners.