On the relationships between processing speed, intra-subject variability, working memory, and fluid intelligence – A cross-sectional study

Y. Schulz-Zhecheva, M.C. Voelkle, M. Biscaldi, A. Beauducel and C. Klein

Intelligence, 2024, vol. 105, issue C

Abstract: The developmental cascade model, elaborated by Fry and Hale (2000) emphasizes the role of age-related increases in processing speed and working memory for the development of fluid intelligence. Given the intimate relationships between intra-subject variability and the aforementioned constructs, the present study set out to determine the role of intra-subject variability within the pathways outlined in the developmental cascade model, postulating a fundamental role of intra-subject variability for the development of processing speed, working memory and fluid intelligence. To that end, N = 403 participants aged 8–18 years took a testing battery including choice reaction time tasks to measure processing speed and intra-subject variability as well as span, operation span and coordination tasks to measure working memory within the empirical framework of Oberauer et al. (2003). Cattell's Culture Fair Test (CFT-20 R) was used to measure fluid intelligence. Our results confirm the well-known close relationships between processing speed, working memory, and fluid intelligence, and show that intra-subject variability is also closely related to these constructs. The results of the present study suggest the extension of the developmental cascade model by the inclusion of intra-subject variability as a fundamental construct.

Keywords: Intra-subject variability; Processing speed; Working memory; Intelligence; Developmental cascade model (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:intell:v:105:y:2024:i:c:s0160289624000308

DOI: 10.1016/j.intell.2024.101836

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