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The contribution of episodic long-term memory to working memory for bindings
Lea M Bartsch1, Klaus Oberauer1
1University of Zurich, Switzerland.
Cognition
|November 27, 2022
Summary
Working memory capacity is limited by binding interference, not item limits. Episodic long-term memory aids binding memory when working memory is strained.
Area of Science:
- Cognitive Psychology
- Neuroscience
Background:
- Working memory (WM) capacity is a key area of cognitive research.
- The Binding Hypothesis suggests WM capacity is limited by interference between item bindings.
Purpose of the Study:
- To investigate the capacity limits of working memory.
- To test the Binding Hypothesis and the role of episodic long-term memory (LTM) in binding memory.
Main Methods:
- Immediate memory for word-picture pairs was tested across varying set sizes.
- Proactive interference and distractor-filled delays were manipulated to assess WM and LTM contributions.
Main Results:
- Memory for bindings declined faster than item memory with increasing set size, supporting the Binding Hypothesis.
- Episodic LTM compensated for WM limitations at larger set sizes.
- A double dissociation was observed: large set sizes were affected by proactive interference but not delays, while small set sizes were affected by delays but not proactive interference.
Conclusions:
- Working memory capacity is constrained by binding interference, not item capacity.
- Episodic LTM plays a crucial role in supporting binding memory when WM capacity is exceeded.
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