Related Experiment Video
Updated: Sep 9, 2025
08:08
Real-time Electrophysiology: Using Closed-loop Protocols to Probe Neuronal Dynamics and Beyond
Published on: June 24, 2015
11.6K
Closed-Loop Connectivity Best Supports Angular Tuning and Sleep Dynamics in a Biophysical Thalamocortical Circuit
Joao Vs Moreira1, Fernando S Borges1, Zoe Atherton2
1Department of Physiology and Pharmacology, State University of New York - Downstate Health Sciences University, Brooklyn, NY 11203, USA.
Biorxiv : the Preprint Server for Biology
|September 2, 2025
Summary
Closed-loop circuits in the thalamus best explain neural activity across states. This organization refines sensory tuning and supports sleep rhythms, resolving a key question in thalamo-cortical connectivity.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Systems Neuroscience
Background:
- Thalamic and cortical connectivity organization remains unclear.
- Distinguishing between reciprocal (closed-loop) and non-reciprocal (open-loop) circuits is challenging with current methods.
Purpose of the Study:
- To determine the circuit organization of intrathalamic and corticothalamic projections.
- To investigate how circuit organization impacts thalamic function across behavioral states.
Main Methods:
- Developed a biophysically detailed multi-compartmental model of the mouse whisker pathway.
- Simulated thalamic spiking and local field potential responses under different connectivity scenarios.
Main Results:
- Closed-loop intrathalamic projections between ventral posteromedial nucleus (VPM) thalamocortical (TC) relay neurons and thalamic reticular nucleus (TRN) inhibitory neurons best matched experimental data.
- Increased closed-loop projections enhanced awake-state angular tuning and supported sleep-state spindle oscillations.
- Activated closed-loop corticothalamic feedback sharpened thalamic angular tuning.
Conclusions:
- Closed-loop intrathalamic projections are crucial for accurately modeling thalamic activity across awake and sleep states.
- Thalamo-cortical circuit organization plays a vital role in balancing sensory information processing and maintaining brain rhythms.
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