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Strategic control of location and ordinal context in visual working memory
Jacqueline M Fulvio1, Qing Yu2,3, Bradley R Postle1,2
1Department of Psychology, University of Wisconsin-Madison, 1202 West Johnson St. Madison, WI 53706, USA.
Cerebral Cortex (New York, N.Y. : 1991)
|May 10, 2023
Summary
Strategic control over context binding in visual working memory (WM) was investigated. The posterior parietal cortex (PPC) strategically filters sample information, demonstrating its role in managing context within WM.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neuroimaging
Background:
- Working memory (WM) involves encoding both stimulus identity and contextual information.
- Understanding the neural mechanisms of strategic context binding in WM is crucial.
Purpose of the Study:
- To explore the neural bases of strategic control over context binding in visual working memory.
- To investigate how different context relevance instructions affect neural representations.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used.
- Subjects performed delayed recognition tasks with varying context relevance instructions (location, order, or orientation).
- Multivariate decoding and inverted encoding modeling were applied to fMRI data.
Main Results:
- Posterior parietal cortex (PPC) showed greater delay period signal for context-relevant trials.
- Both occipital cortex and PPC exhibited sensitivity to context binding requirements and domain.
- Distinct representational patterns in occipital cortex and PPC suggest different context-processing roles.
Conclusions:
- The PPC plays a strategic role in controlling the representation of stimulus context in visual WM.
- Occipital cortex reinstates sample locations, while PPC filters information based on trial type.
- These findings elucidate the neural dynamics of context management in working memory.
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