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Neural system for updating object working memory from different sources: sensory stimuli or long-term memory
Jennifer K Roth1, Susan M Courtney
1Magnetic Resonance Research Center, Department of Diagnostic Radiology, Yale University School of Medicine, 300 Cedar Street, New Haven, CT 06520, USA. jennifer.roth@yale.edu
Neuroimage
|September 25, 2007
Summary
Updating working memory (WM) uses a single fronto-parietal network, regardless of whether new information comes from sensory stimuli (SS) or long-term memory (LTM). This network interacts differently based on the information source.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
Background:
- Working memory (WM) involves actively maintaining relevant information.
- Updating WM content is crucial when new information supersedes old.
- New information can originate from sensory stimuli (SS) or long-term memory (LTM).
Purpose of the Study:
- To investigate the neural mechanisms underlying working memory updating.
- To determine if updating WM from different sources (SS vs. LTM) involves distinct or shared neural systems.
- To explore functional connectivity within the WM updating network based on information source.
Main Methods:
- fMRI experiments were conducted to observe brain activity during WM updating tasks.
- Participants updated WM from both sensory stimuli and long-term memory.
- Functional connectivity analyses were performed to examine network interactions.
Main Results:
- A common fronto-parietal network, including SMA, parietal cortex, and IFJ, was active for updating WM from both SS and LTM.
- Bilateral cuneus showed increased activity during LTM updating, attributed to LTM recall itself.
- Functional connectivity revealed source-specific interactions: visual regions for SS updates, LTM regions for LTM updates.
Conclusions:
- A unified neural mechanism supports working memory updating, irrespective of information source (SS or LTM).
- The fronto-parietal updating network exhibits flexible interactions with modality-specific regions (visual or LTM) based on the origin of new information.
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