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Pathway mechanism for excitatory and inhibitory control in working memory
Helen Barbas1,2,3, Jingyi Wang1,2, Mary Kate P Joyce1,3
1Neural Systems Laboratory, Boston University , Boston, Massachusetts.
Journal of Neurophysiology
|September 27, 2018
Summary
Working memory relies on brain circuit mechanisms for attending and suppressing stimuli. Cortical connections, varying by laminar structure, enable dynamic pathway recruitment for complex cognitive tasks.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Systems Neuroscience
Background:
- Working memory is crucial for daily tasks, involving temporary information storage and sequencing.
- Understanding the neural circuit mechanisms underlying working memory is essential.
Purpose of the Study:
- To explore how cortical connectivity, based on laminar structure, supports working memory.
- To elucidate the role of specific neural pathways and inhibitory neurons in working memory processes.
Main Methods:
- Analysis of laminar structure variation across cortical systems.
- Examination of connection patterns based on the "structural model" of cortical areas.
- Investigation of prefrontal, amygdalar, and hippocampal pathways.
Main Results:
- Cortical connections vary systematically in laminar distribution and strength based on area type.
- Diverse pathways are recruited through systematic architectonic variation.
- Interactions with excitatory and inhibitory neurons facilitate stimulus selection and suppression.
Conclusions:
- Systematic variation in laminar structure underlies diverse, dynamically recruited pathways for working memory.
- Prefrontal, amygdalar, and hippocampal pathways, along with basal ganglia and cerebellar connections, support sequential information processing.
- The interplay of connections and inhibitory neurons enables flexible cortical network dynamics for working memory.
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