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Updated: Jul 14, 2025
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Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation
Published on: February 23, 2020
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A thalamo-parietal cortex circuit is critical for place-action coordination
Christine M Simmons1, Shawn C Moseley1, Jordan D Ogg1
1Department of Psychology, Program of Neuroscience, Florida State University, Tallahassee, Florida, USA.
Hippocampus
|October 9, 2023
Summary
The anterior and lateral thalamus (ALT) and parietal cortex (PC) circuit is crucial for navigation. Inactivating this pathway impairs rats' ability to link spatial locations with correct actions, highlighting its role in goal-directed movement.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Spatial Navigation
Background:
- The anterior and lateral thalamus (ALT) contains head direction cells crucial for environmental orientation.
- The parietal cortex (PC) is hypothesized to integrate viewer-dependent and viewer-independent spatial frames.
- Coordinated ALT-PC function is essential for navigating towards remembered locations.
Purpose of the Study:
- To investigate the functional connectivity between the ALT and PC in spatial navigation.
- To determine the role of the ALT-PC circuit in linking spatial locations with specific actions.
Main Methods:
- A place-action task was employed using a four-arm maze in rats.
- Muscimol inactivation targeted bilateral PC, bilateral ALT, or the ALT-PC network.
- Performance was compared between muscimol and saline sessions within the same animal.
Main Results:
- All inactivations reduced accuracy in the place-action task.
- Bilateral PC inactivation specifically increased non-selection errors and response latencies.
- These findings implicate the ALT-PC circuit in successful goal-directed navigation.
Conclusions:
- The ALT-PC circuit is critical for associating spatial locations with appropriate motor actions.
- Disrupting this circuit impairs the ability to navigate towards remembered allocentric locations.
- This research elucidates a key neural mechanism underlying spatial memory-guided behavior.
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