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Assessing Working Memory in Children: The Comprehensive Assessment Battery for Children – Working Memory (CABC-WM)
Published on: June 12, 2017
Core verbal working-memory capacity: the limit in words retained without covert articulation
1Department of Psychological Sciences, University of Missouri, Columbia, MO 65211, USA. zcc3c@mizzou.edu
Quarterly Journal of Experimental Psychology (2006)
|December 3, 2008
Summary
This study reveals a core verbal working memory capacity of approximately 3 chunks. By preventing phonological rehearsal, researchers isolated conceptual units, demonstrating a consistent capacity limit.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Human Memory
Background:
- Verbal working memory (VWM) is theorized to integrate phonological and conceptual information.
- Previous research (Chen & Cowan, 2005) explored VWM capacity using lists of single words and word pairs.
Purpose of the Study:
- To disentangle the contributions of phonological and conceptual units in VWM.
- To determine the core capacity of VWM when phonological rehearsal is inhibited.
Main Methods:
- Extended a prior procedure involving recall from lists of word singletons and word pairs.
- Manipulated list length and item type (singletons vs. pairs) to assess capacity.
- Prevented covert phonological rehearsal during memory tasks.
Main Results:
- A constant VWM capacity of approximately 3 chunks was observed across different list lengths and types.
- This capacity held true specifically when covert phonological rehearsal was suppressed.
Conclusions:
- VWM capacity is constrained by a core limit of roughly 3 conceptual chunks.
- Phonological processing represents a significant, but separable, component of VWM performance.
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