An Embedded-Processes Model of Working Memory

Cowan, Nelson · 1999 · OpenAlex

DOI: 10.1017/cbo9781139174909.006

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Summary

Nelson Cowan’s 1999 chapter, "An Embedded-Processes Model of Working Memory," proposes a theoretical framework that integrates memory and attention, challenging the view of working memory as a distinct storage system separate from long-term memory. The model is motivated by the need to explain how information is temporarily available for complex cognitive tasks, such as language comprehension and problem solving, while accounting for the interplay between automatic and voluntary processes. Cowan defines working memory functionally as the set of mechanisms that keep information accessible for mental tasks, rather than defining it by specific structural components. The core of the embedded-processes model rests on five principles. First, working memory consists of hierarchically arranged items: long-term memory, the subset of long-term memory currently activated, and the subset of activated memory within the focus of attention. Second, different limits apply to these levels; the focus of attention is capacity-limited (holding approximately 3 to 5 unrelated items), whereas activation is time-limited (lasting 10 to 20 seconds without reactivation). Third, the focus of attention is controlled conjointly by voluntary processes (the central executive) and involuntary processes (the attentional orienting system). Fourth, habituation occurs for familiar stimuli, allowing them to activate memory features without eliciting awareness. Fifth, awareness enhances feature encoding and allows for explicit recall. Cowan supports this model with empirical evidence regarding encoding, maintenance, and retrieval. Studies on auditory memory demonstrate that unattended stimuli undergo partial encoding, preserving physical features (like vowels) better than complex semantic features (like consonants), unless attention is directed to them. For instance, in dual-task experiments, attending to auditory stimuli improved the retention of consonants, suggesting attention facilitates categorical coding. Regarding maintenance, Cowan argues against the idea that rehearsal speed alone determines memory span. Instead, he posits that memory search processes during inter-item pauses help reactivate items. Data from children’s recall tasks show that age affects the speed of these covert search processes, while word length affects overt pronunciation speed; together, these factors account for significant variance in memory span. Retrieval is defined as bringing items into the focus of attention, which is constrained by both capacity and the rapid decay of activation. The significance of this model lies in its unitary approach to working memory, suggesting that sensory and abstract codes share similar activation and decay properties, differing primarily in the nature of interference. It clarifies the distinction between activation (which can occur outside awareness) and the focus of attention (which equates to conscious awareness). By linking working memory directly to long-term memory and attentional mechanisms, the model provides a comprehensive explanation for how individuals manage information under nonoptimal conditions, such as interference or divided attention, and offers a biological basis for these processes through event-related potential studies.

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Topics

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• working memory
• capacity resource theory