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Asymmetric Signaling Hierarchy Cytoarchitecture

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Seminar✓ Recording AvailableNeuroscience

Asymmetric signaling across the hierarchy of cytoarchitecture within the human connectome

Linden Parkes

Dr

Rutgers Brain Health Institute

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Thursday, March 23, 2023

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Friday, March 24, 2023

12:00 AM Asia/Tokyo

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Host: Sydney Systems Neuroscience and Complexity SNAC

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Sydney Systems Neuroscience and Complexity SNAC

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60.00 minutes

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Abstract

Cortical variations in cytoarchitecture form a sensory-fugal axis that shapes regional profiles of extrinsic connectivity and is thought to guide signal propagation and integration across the cortical hierarchy. While neuroimaging work has shown that this axis constrains local properties of the human connectome, it remains unclear whether it also shapes the asymmetric signaling that arises from higher-order topology. Here, we used network control theory to examine the amount of energy required to propagate dynamics across the sensory-fugal axis. Our results revealed an asymmetry in this energy, indicating that bottom-up transitions were easier to complete compared to top-down. Supporting analyses demonstrated that asymmetries were underpinned by a connectome topology that is wired to support efficient bottom-up signaling. Lastly, we found that asymmetries correlated with differences in communicability and intrinsic neuronal time scales and lessened throughout youth. Our results show that cortical variation in cytoarchitecture may guide the formation of macroscopic connectome topology.

Topics

asymmetric signalingbottom-up transitionscommunicabilityconnectomecytoarchitecturehierarchyhuman connectomenetwork control theorysensory-fugal axistop-down transitions

About the Speaker

Linden Parkes

Dr

Rutgers Brain Health Institute

Contact & Resources

Personal Website

parkeslab.com

@LindenParkes

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twitter.com/LindenParkes

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