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Published on: April 24, 2009
The intralaminar thalamic nuclei contribute to remote spatial memory.
Joëlle Lopez1, Mathieu Wolff, Lucas Lecourtier
1Laboratoire d'Imagerie et de Neurosciences Cognitives, Université de Strasbourg, Institut Fédératif de Recherche 37 des Neurosciences, Groupement de Recherche, Centre National de Recherche Scientifique 2905 Neuromem, F-67000 Strasbourg, France.
Summary
Lesions in the anterior thalamic nuclei (ATN) impair spatial memory acquisition. However, lateral thalamic nuclei (ILN/LT) lesions disrupt remote memory retrieval, suggesting a role in memory consolidation.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Systems Neuroscience
Background:
- The anterior thalamic nuclei (ATN) and lateral thalamic nuclei (ILN/LT) are implicated in memory processes.
- These nuclei connect with the hippocampus and prefrontal cortex, potentially influencing memory consolidation.
Purpose of the Study:
- To investigate the roles of ATN and ILN/LT in the acquisition and retrieval of spatial memory.
- To determine if lesions to these nuclei affect recent versus remote memory recall.
Main Methods:
- Spatial memory was assessed in rats using the Morris water maze.
- Lesions were made in the ATN or ILN/LT.
- Memory retrieval was tested after short (5 days) and long (25 days) delays.
Main Results:
- ATN lesions impaired spatial memory acquisition and retrieval at both recent and remote delays.
- ILN/LT lesions did not affect acquisition but impaired remote memory retrieval, while recent memory retrieval remained intact.
Conclusions:
- ATN is crucial for spatial memory acquisition.
- ILN/LT plays a specific role in the processing or retrieval of remote spatial memories during systems consolidation.
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