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Related Concept Videos

Working Memory01:24

Working Memory

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Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this...
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Visual Agnosia01:12

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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Related Experiment Video

Updated: Feb 26, 2026

Using Rapid Serial Visual Presentation to Measure Set-Specific Capture, a Consequence of Distraction While Multitasking
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Clear evidence for item limits in visual working memory.

Kirsten C S Adam1, Edward K Vogel2, Edward Awh2

  • 1Institute for Mind and Biology, University of Chicago, United States; Department of Psychology, University of Chicago, United States.

Cognitive Psychology
|July 23, 2017
PubMed
Summary
This summary is machine-generated.

Working memory (WM) capacity is limited, with new research suggesting guesses, not low-precision memories, explain these limitations. This study found evidence for a capacity limit of 3-4 items in visual working memory.

Keywords:
Capacity limitsMetacognitionPrecisionVisual working memory

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Memory

Background:

  • Visual working memory (WM) is known to have limited resources.
  • A persistent debate exists on whether WM has a strict item limit or allows for low-precision storage.

Purpose of the Study:

  • To investigate the nature of limitations in visual working memory.
  • To determine if guessing or low-precision representations best explain performance decrements.

Main Methods:

  • A whole report memory procedure was employed, where subjects reported all items and indicated guessing.
  • Response error distributions were analyzed using a parameter-free guessing model.
  • Self-reported guessing was compared with mixture model estimations.

Main Results:

  • When recalling 6 items, approximately 3 items' errors fit a guessing model.
  • Subjective reports of guessing accurately predicted objective guessing rates.
  • Guessing persisted even when subjects were instructed not to guess, ruling out output interference.

Conclusions:

  • Limitations in visual working memory are best explained by guessing behavior, not low-precision storage.
  • Evidence supports a capacity-limited WM system with a limit of 3-4 individuated items.