Exploring the Central Executive

Baddeley, Alan · 1996 · The Quarterly Journal of Experimental Psychology Section A

DOI: 10.1080/713755608

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Summary

This paper addresses the theoretical and empirical challenge of defining the "central executive," a component of Baddeley and Hitch’s working memory model that had remained poorly specified and criticized as a vague "homunculus." While the phonological loop and visuo-spatial sketchpad had been extensively studied, the central executive—responsible for control functions—lagged behind. The author argues against defining the executive strictly by neuroanatomical location (e.g., frontal lobes) or general intelligence metrics, proposing instead a functional approach that fractionates the executive into distinct, analyzable processes. The paper outlines a research strategy illustrated by four lines of inquiry, with detailed evidence provided for the first two. The first line examines the capacity to coordinate performance on two separate tasks. Studies involving Alzheimer’s disease (AD) patients, normal elderly controls, and young controls utilized dual-task paradigms, such as combining pursuit tracking or box-crossing with digit span or reaction time tasks. Results showed that AD patients suffered significantly greater impairment in dual-task conditions than controls, even when single-task performance was equated. This deficit was not observed in normal aging, suggesting that the coordination of concurrent tasks is a specific executive function impaired in dementia. Further studies with frontal lobe patients linked poor dual-task performance specifically to behavioral disinhibition, rather than to deficits in standard frontal tests like verbal fluency or the Wisconsin Card Sorting Test. The second line of research investigates the capacity to switch retrieval strategies, measured through random generation tasks. Building on earlier findings that subjects struggle to produce truly random sequences, the paper links this difficulty to the Supervisory Attentional System (SAS) proposed by Norman and Shallice. The executive is posited to inhibit habitual responses to allow for random selection. The text notes that the speed of generation and the size of the selection set constrain randomness, reflecting a limited-capacity control system. The paper also briefly mentions two additional avenues: selective attention (inhibiting disruptive stimuli) and the manipulation of information in long-term memory (working memory span), though these are less detailed in the provided text. The significance of this work lies in its move toward a functional, rather than anatomical, definition of executive control. By demonstrating that specific executive functions—such as dual-task coordination and strategy switching—can be isolated and measured, the paper supports the view that the central executive may comprise multiple interacting processes rather than a single unitary controller. This approach provides a framework for understanding cognitive deficits in neuropsychological conditions and suggests that continuing to analyze these component functions is a fruitful path for refining the working memory model.

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Topics

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• executive function
• working memory
• cognitive capacity variation