Working Memory: Theories, Models, and Controversies

Baddeley, Alan · 2011 · Annual Review of Psychology

DOI: 10.1146/annurev-psych-120710-100422

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Summary

This review article by Alan Baddeley traces the historical development and theoretical evolution of the multicomponent model of working memory (M-WM). The paper addresses the need to distinguish between the stable overarching theoretical framework of working memory and the specific, evolving models constructed within it. Motivated by the limitations of earlier short-term memory (STM) theories, particularly the dominant Atkinson-Shiffrin model, Baddeley outlines how his research shifted from viewing memory as a simple temporary store to a complex system involving both storage and manipulation. The review also examines alternative theories, neurobiological approaches, and the value of applying these models beyond laboratory settings. The narrative is structured around Baddeley’s empirical journey, beginning with his early work at the Medical Research Council Applied Psychology Unit. Initial research focused on the acoustic similarity effect, where Baddeley demonstrated that phonological similarity significantly impaired immediate recall compared to semantic similarity, leading to the hypothesis of separate phonological (STM) and semantic (LTM) stores. This was further refined through studies on amnesic patients and two-component memory tasks, which revealed that recency effects were not solely dependent on verbal STM. The pivotal development occurred in 1972 with Graham Hitch, where they challenged the assumption that STM maintenance guarantees long-term transfer. Instead, they proposed that working memory involves an active central executive component alongside subsidiary storage systems, marking a departure from passive storage models. Key findings discussed include the characterization of the phonological loop and the visuo-spatial sketchpad as distinct subsystems. The phonological loop is defined by phenomena such as the phonological similarity effect, word length effect, and articulatory suppression, indicating a mechanism for retaining serial order through subvocal rehearsal. The visuo-spatial sketchpad handles visual and spatial information separately. The central executive is described as the attentional control system that coordinates these subsystems and interfaces with long-term memory. The paper highlights that while the broad framework has remained stable, specific models have evolved to account for binding processes and the integration of long-term memory, such as the addition of the episodic buffer. The significance of this work lies in its establishment of working memory as a dynamic, multicomponent system rather than a unitary store. Baddeley concludes by emphasizing the importance of "explorer" versus "architect" approaches to theory building, advocating for models that are productive and generate new questions. The review underscores the necessity of testing these theories in real-world applications and acknowledges controversies regarding the nature of the central executive and the relationship between working memory and long-term memory. By synthesizing decades of research, the paper provides a comprehensive overview of how empirical evidence has shaped the current understanding of cognitive architecture, influencing both theoretical psychology and practical applications in fields such as education and clinical assessment.

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• working memory