The roles of working memory updating and processing speed in mediating age-related differences in fluid intelligence

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	The roles of working memory updating and processing speed in mediating age-related differences in fluid intelligence
	Chen, Tianyong; Li, Deming
摘要	This study was conducted to investigate the relative roles of working memory updating (updating) and processing speed in mediating age-related differences in fluid intelligence. A sample of 142 normal adults between 18 and 85 years of age performed a set of updating, processing speed, and fluid intelligence tasks. Hierarchical regression analyses indicated that the proportion of unique age-related variance in updating measures was related to the complexity of speed measures. There was a larger proportion of unique age-related variance in updating measures after controlling for the variance in simpler speed measures. Moreover, structural equation modeling showed that updating mediated almost all the age-related effects on fluid intelligence. These results suggest that updating, but not speed, is the critical mediator between age and fluid intelligence. In addition, the speed mediation of age-related differences in fluid intelligence as indicated by previous studies is at least partially derived from the executive component of speed measures.; This study was conducted to investigate the relative roles of working memory updating (updating) and processing speed in mediating age-related differences in fluid intelligence. A sample of 142 normal adults between 18 and 85 years of age performed a set of updating, processing speed, and fluid intelligence tasks. Hierarchical regression analyses indicated that the proportion of unique age-related variance in updating measures was related to the complexity of speed measures. There was a larger proportion of unique age-related variance in updating measures after controlling for the variance in simpler speed measures. Moreover, structural equation modeling showed that updating mediated almost all the age-related effects on fluid intelligence. These results suggest that updating, but not speed, is the critical mediator between age and fluid intelligence. In addition, the speed mediation of age-related differences in fluid intelligence as indicated by previous studies is at least partially derived from the executive component of speed measures.
关键词	latent variable analysis short-term-memory executive processes capacity cognition
学科领域	认知心理学
	2007-11-01
语种	英语
发表期刊	AGING NEUROPSYCHOLOGY AND COGNITION
ISSN	1382-5585
卷号	14 期号:6 页码:631-646
期刊论文类型	Article
收录类别	SSCI
WOS记录号	WOS:000251464900006
引用统计	被引频次：65[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.psych.ac.cn/handle/311026/5795
专题	中国科学院心理研究所回溯数据库(1956-2010)
作者单位	Chinese Acad Sci, Inst Psychol, Key Lab Mental Hlth, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Chen, Tianyong,Li, Deming. The roles of working memory updating and processing speed in mediating age-related differences in fluid intelligence[J]. AGING NEUROPSYCHOLOGY AND COGNITION,2007,14(6):631-646.
APA	Chen, Tianyong,&Li, Deming.(2007).The roles of working memory updating and processing speed in mediating age-related differences in fluid intelligence.AGING NEUROPSYCHOLOGY AND COGNITION,14(6),631-646.
MLA	Chen, Tianyong,et al."The roles of working memory updating and processing speed in mediating age-related differences in fluid intelligence".AGING NEUROPSYCHOLOGY AND COGNITION 14.6(2007):631-646.

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