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A Hierarchy of Functional States in Working Memory
- Source :
- The Journal of Neuroscience
- Publication Year :
- 2021
- Publisher :
- Society for Neuroscience, 2021.
-
Abstract
- Extensive research has examined how information is maintained in working memory (WM), but it remains unknown how WM is used to guide behavior. We addressed this question by combining human electrophysiology (50 subjects, male and female) with pattern analyses, cognitive modeling, and a task requiring the prolonged maintenance of two WM items and priority shifts between them. This enabled us to discern neural states coding for memories that were selected to guide the next decision from states coding for concurrently held memories that were maintained for later use, and to examine how these states contribute to WM-based decisions. Selected memories were encoded in a functionally active state. This state was reflected in spontaneous brain activity during the delay period, closely tracked moment-to-moment fluctuations in the quality of evidence integration, and also predicted when memories would interfere with each other. In contrast, concurrently held memories were encoded in a functionally latent state. This state was reflected only in stimulus-evoked brain activity, tracked memory precision at longer timescales, but did not engage with ongoing decision dynamics. Intriguingly, the two functional states were highly flexible, as priority could be dynamically shifted back and forth between memories without degrading their precision. These results delineate a hierarchy of functional states, whereby latent memories supporting general maintenance are transformed into active decision circuits to guide flexible behavior.SIGNIFICANCE STATEMENTWorking memory enables maintenance of information that is no longer available in the environment. Abundant neuroscientific work has examined where in the brain working memories are stored, but it remains unknown how they are represented and used to guide behavior. Our study shows that working memories are represented in qualitatively different formats, depending on behavioral priorities. Memories that are selected for guiding behavior are encoded in an active state that transforms sensory input into decision variables, whereas other concurrently held memories are encoded in a latent state that supports precise maintenance without affecting ongoing cognition. These results dissociate mechanisms supporting memory storage and usage, and open the door to reveal not only where memories are stored but also how.
- Subjects :
- Adult
Male
Adolescent
decoding
Brain activity and meditation
Computer science
Behavioral/Cognitive
Models, Neurological
Electroencephalography
working memory
050105 experimental psychology
Task (project management)
Young Adult
03 medical and health sciences
0302 clinical medicine
medicine
Humans
representational states
0501 psychology and cognitive sciences
cognitive control
EEG
Research Articles
030304 developmental biology
Statement (computer science)
0303 health sciences
medicine.diagnostic_test
Hierarchy (mathematics)
Working memory
General Neuroscience
05 social sciences
Brain
Cognition
decision-making
Memory, Short-Term
Female
State (computer science)
030217 neurology & neurosurgery
Cognitive psychology
Coding (social sciences)
Subjects
Details
- ISSN :
- 15292401 and 02706474
- Volume :
- 41
- Database :
- OpenAIRE
- Journal :
- The Journal of Neuroscience
- Accession number :
- edsair.doi.dedup.....991cf08767beb3d5a25cc3c68a7e8aaf