Working Memory Maturation
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Summary
This review article by Nelson Cowan (2016) addresses the theoretical and practical understanding of cognitive development by examining the maturation of working memory. The central research problem is reconciling contradictory findings in developmental psychology: infant studies often suggest that working memory capacity reaches adult levels early in life, whereas studies with older children show a steady increase in capacity throughout childhood. This discrepancy creates a paradox where capacity appears to regress during early childhood. Cowan aims to determine whether working memory capacity is constant from infancy onward, with improvements driven by secondary factors, or if there is genuine maturation of basic capacity. The author conducts a comprehensive review of the literature, contrasting methodologies used in infant research (e.g., violation-of-expectation paradigms) with those used in child research (e.g., span tasks). Cowan analyzes potential confounding factors that might explain developmental improvements without assuming capacity growth, including increases in knowledge, better filtering of irrelevant distractions, the use of encoding and rehearsal strategies, and pattern formation. The review also incorporates data from Gathercole et al. (2004), which documents steady improvements in working memory performance from age 4 to 15 across various tasks, including simple span and processing-span measures. The findings indicate that while secondary factors like strategy use and knowledge contribute to performance gains, they do not fully account for developmental progress. When these confounding variables are controlled, working memory performance still improves during the school years. Cowan argues that infant studies likely overestimate capacity because they rely on tasks with different demands and supports compared to adult-level tasks. The review supports the neo-Piagetian view that fundamental information-processing parameters, specifically working memory capacity, mature with development. This maturation allows for the coordination of more complex schemes and concepts. The significance of this work lies in clarifying the nature of cognitive growth. By resolving the infant-child discrepancy, the paper reinforces the importance of working memory as a key mechanism in cognitive development, influencing language comprehension, problem-solving, and fluid intelligence. Cowan concludes that understanding the development of working memory capacity is essential for explaining limits on concurrent operations and conceptual complexity. The article suggests future research should bridge the gap between infant and child methodologies, focus on the development of attention control, and further pinpoint the nature of capacity changes from infancy through adulthood.
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Summary generated by qwen3.6-27b-prismaquant on 2026-06-09; verification: verified.
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