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Working memory recruits long-term memory when it is beneficial: Evidence from the Hebb effect.
1Cognitive Psychology Unit, Department of Psychology, University of Zurich.
Journal of Experimental Psychology. General
|September 28, 2021
Summary
Working memory (WM) selectively uses prior knowledge from long-term memory (LTM) only when beneficial, preventing interference. This flexible recruitment enhances memory performance by leveraging helpful LTM information.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Memory Research
Background:
- Prior knowledge from long-term memory (LTM) can aid working memory (WM) encoding.
- However, LTM can also interfere with WM contents, posing a challenge for cognitive control.
Purpose of the Study:
- To investigate whether working memory (WM) selectively recruits information from long-term memory (LTM).
- To determine if WM utilizes LTM knowledge only when beneficial, avoiding proactive interference.
Main Methods:
- Utilized variants of the Hebb paradigm with immediate serial recall of lists.
- Manipulated list structures to create conditions where LTM knowledge was potentially helpful, harmful, or neutral.
Main Results:
- No proactive interference was observed when LTM knowledge shared items but not order with WM lists.
- When LTM knowledge partially overlapped in item and order, participants flexibly used it for beneficial parts, boosting subsequent memory.
Conclusions:
- Working memory (WM) employs a flexible gating mechanism to control information flow from long-term memory (LTM).
- LTM knowledge is recruited selectively, prioritizing beneficial information and preventing interference, thereby optimizing cognitive performance.
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