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Define “working memory.” Explain the relation between working memory and short-term memory. Provide original examples in which the limits of working memory are exceeded. Do Demonstration 4.2.
Working memory is a limited-capacity system that actively holds and manipulates information for ongoing tasks. It is related to short-term memory, but unlike passive storage, it emphasizes processing and coordination (e.g., solving problems while remembering numbers).
Limits are exceeded when multitasking demands surpass capacity, such as trying to mentally calculate expenses while listening to complex instructions. In Demonstration 4.2, performance declines as task complexity increases, illustrating capacity limits and interference.
Do Demonstration 4.1. Describe the contributions of George Miller and Brown-Peterson and Peterson regarding short-term memory capacity. What is the serial position curve? How does short-term/working memory affect the shape of the curve? Comment: Additional evidence for the magic number seven can be found using the digit-span task, a widely used tool in clinical and intelligence areas to measure short-term/working memory capacity. In this task, a person is presented with four spoken digits in a row that they are to recall immediately in the same order. If all the digits are recalled correctly, the person is presented with five new digits to recall immediately. If those digits are recalled correctly, the task continues by increasing the number of digits to recall by one. The highest number of digits that can be successfully recalled is referred to as the person’s digit span. Most individuals can recall seven digits plus or minus two (i.e., between five and nine digits). There is an interesting developmental pattern in the size of a person’s digit span. The average digit span is two in two-and-a-half-year-olds, five for eight-year-olds, and eight for college students (Howard, 1983). Moreover, very little decline occurs in digit-span capacity as people age. Note that the digit-span task is a measure of how much can be held in working memory (spatial capacity), whereas the Brown-Peterson and Peterson task is a measure of how long information can be held in working memory if we are prevented from rehearsing (temporal capacity).
Miller proposed the 7±2 capacity limit, emphasizing chunking, while Brown–Peterson and Peterson showed that without rehearsal, information decays rapidly, highlighting temporal limits. The serial position curve shows primacy (long-term encoding) and recency (short-term storage) effects.
Working memory shapes the recency portion because recent items are still active. Comment: The digit-span task measures spatial capacity (amount), typically ~7±2 items, with developmental increases but little aging decline; Brown–Peterson measures temporal duration without rehearsal.
Describe how the semantic meaning of words can be shown to affect working memory capacity. Be sure that your answer includes a definition of “proactive interference (PI)” and “release from P.” How is this related to demonstration 4.1?
Semantic meaning affects working memory through proactive interference (PI), where earlier information disrupts recall of new information. Release from PI occurs when a shift in semantic category improves recall, showing that meaning structures memory.
In Demonstration 4.1, repeated similar categories reduce recall due to PI, but switching categories restores performance (release), demonstrating that working memory is sensitive to semantic organization.
Briefly describe Atkinson and Shiffrin’s model of memory and Baddeley’s model of working memory. Be sure that you describe the properties of each component for each model. Describe the evidence for independent capacities in Baddeley’s model of working memory.
Atkinson–Shiffrin’s model includes sensory memory, short-term memory (limited capacity, rehearsal-dependent), and long-term memory (durable storage). It treats STM largely as a passive holding system.
Baddeley’s model includes the phonological loop, visuospatial sketchpad, central executive, and episodic buffer, emphasizing active processing. Evidence for independent capacities comes from dual-task studies showing minimal interference when tasks use different subsystems.
What are acoustic confusions, and what do they reveal about the properties of the phonological loop? How is the phonological loop used in other aspects of daily life? What does the neuroscience research reveal about this component?
Acoustic confusions occur when similar-sounding items (e.g., B, D, P) are mixed up, showing that the phonological loop encodes information based on sound.
It is used in everyday tasks like rehearsing phone numbers or language learning. Neuroscience links it to left-hemisphere language areas, especially Broca’s area (rehearsal) and temporal regions (storage).
Describe the visuospatial sketchpad. Summarize the research on the visuospatial sketchpad. How is the visuospatial sketchpad used in other aspects of daily life? What does the neuroscience research reveal about this component?
The visuospatial sketchpad temporarily stores and manipulates visual and spatial information, such as images or locations.
Research shows interference when performing multiple visual tasks simultaneously, supporting a distinct subsystem. It is used in navigation, mental imagery, and design tasks, and is associated with occipital and parietal brain regions, often in the right hemisphere.
Do Demonstration 4.3. Describe the central executive and the characteristics of this component. Provide several examples of tasks that require central executive processes. Describe its relation to daydreaming. What does the neuroscience research reveal about this component? Comment: The central executive component in Baddeley’s model is the “processing part” of working memory and has been implicated in a number of clinical syndromes. Baddeley (1986) used the term Dysexecutive Syndrome to describe patients with impaired functioning of the central executive. Typically, these patients were found to have damage in their frontal lobes and disorders in planning, organizing, problem solving, and attention. The Dysexecutive Syndrome has been reported in patients with Alzheimer’s disease, Parkinson’s disease, and schizophrenia.
The central executive controls attention, allocates resources, switches tasks, and integrates information, acting as the control system of working memory.
It is used in planning, problem solving, multitasking, and inhibiting distractions; it is also linked to mind-wandering/daydreaming when control is loosened. Neuroscience associates it with the prefrontal cortex. Comment: Damage leads to dysexecutive syndrome, affecting planning and attention, seen in disorders like Alzheimer’s and schizophrenia.
What is the episodic buffer? Why was it developed after the other three components?
The episodic buffer is a limited-capacity system that integrates information from different subsystems and long-term memory into a coherent episode.
It was added later to explain how multimodal information (visual, verbal, contextual) is combined, something not fully accounted for by the original three components.
Summarize the application of working memory research in education and clinical population. Comment: Another important variable associated with working memory performance is age. Baddeley (1986) found that older adults performed more poorly than younger adults on measures of central executive functioning. Moreover, the decline in working memory performance has been linked to age differences in language tasks and other long-term memory tasks. These findings illustrate that working memory has an important role in processing language and in transferring information to long-term storage. Note that these age differences should not be interpreted as a negative consequence of aging. Tasks that measure central executive function are usually timed tasks that require a series of rapid responses and are meant to exceed our normal capacity. Tasks that are not timed and require a slower response rate usually reveal no age differences
Working memory research informs education by emphasizing chunking, reducing cognitive load, and using multimodal teaching to match subsystem capacities.
Clinically, it helps explain deficits in disorders affecting attention and executive function. Comment: Aging may reduce central executive performance in fast tasks, affecting language and memory transfer, but slower tasks often show minimal differences.
