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Updated: Mar 19, 2026
09:13
A Real-world What-Where-When Memory Test
Published on: May 16, 2017
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Working memory is not fixed-capacity: More active storage capacity for real-world objects than for simple stimuli
Timothy F Brady1, Viola S Störmer2, George A Alvarez2
1Department of Psychology, University of California, San Diego, La Jolla, CA 92093; timbrady@ucsd.edu.
Summary
Visual working memory capacity is not fixed. Real-world object storage in working memory increases with knowledge, challenging traditional capacity limits.
Area of Science:
- Cognitive Neuroscience
- Psychology
Background:
- Visual working memory (VWM) rapidly encodes simple stimuli like colors and orientations, exhibiting a limited capacity.
- Behavioral studies show increased storage of real-world objects with longer encoding times, often attributed to episodic long-term memory.
Purpose of the Study:
- To investigate whether the enhanced storage of real-world objects in VWM relies solely on episodic long-term memory.
- To determine if active storage mechanisms within VWM contribute to this capacity increase.
Main Methods:
- Directly measured neural activity using electroencephalography (EEG) during the delay period of a VWM task.
- Compared neural data for simple stimuli versus real-world objects to assess storage mechanisms.
Main Results:
- The increased capacity for real-world objects is not solely due to episodic long-term memory.
- Neural activity patterns indicate active storage within VWM for complex, real-world items.
- EEG data challenge fixed-capacity models of VWM.
Conclusions:
- Working memory capacity is flexible and influenced by the nature of the stimuli.
- Existing knowledge plays a crucial role in modulating working memory capacity and function.
- These findings necessitate a revision of fixed-capacity models of visual working memory.
Keywords:
contralateral delay activityvisual long-term memoryvisual memoryvisual short-term memoryworking memory capacityMore Related Videos
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