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Updated: Jul 17, 2025
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Large-scale Three-dimensional Imaging of Cellular Organization in the Mouse Neocortex
Published on: September 5, 2018
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Specialized structure of neural population codes in parietal cortex outputs
Houman Safaai1,2, Alice Y Wang1, Shinichiro Kira1
1Department of Neurobiology, Harvard Medical School, Boston, USA.
Biorxiv : the Preprint Server for Biology
|September 4, 2023
Summary
Cortical neurons projecting to the same brain area form unique networks. These networks enhance information transmission for accurate behavior, especially during correct choices.
Area of Science:
- Neuroscience
- Systems Neuroscience
- Computational Neuroscience
Background:
- Cortical output pathways are crucial for information transmission.
- The organization of population codes within these pathways is not fully understood.
- Understanding neural coding is key to deciphering brain function.
Purpose of the Study:
- To investigate whether cortical neurons projecting to the same target area form specialized population codes.
- To determine how these population codes influence information transmission during a cognitive task.
- To explore the relationship between neural network structure and behavioral accuracy.
Main Methods:
- Utilized in vivo calcium imaging in mouse posterior parietal cortex (PPC).
- Employed retrograde labeling to identify projection targets of neurons.
- Applied statistical multivariate models to analyze neural activity and correlations.
- Assessed performance during a delayed match-to-sample task.
Main Results:
- Posterior parietal cortex (PPC) broadly broadcasts sensory, choice, and locomotion signals.
- Sensory information is specifically enriched in projections to the anterior cingulate cortex.
- Neurons targeting the same area exhibit structured pairwise activity correlations.
- These correlations form information-enhancing networks, unique to projection-specific sub-populations.
- Network structure is present only during correct behavioral choices, not incorrect ones.
Conclusions:
- Cortical output pathways utilize uniquely structured population codes.
- These specialized codes enhance information transmission to specific target areas.
- The observed network structure is critical for guiding accurate behavior.
- Neural population coding is dynamically regulated by behavioral context and accuracy.
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