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Cooperation between the hippocampus and the entorhinal cortex in spatial memory: a disconnection study.
Carole Parron1, Bruno Poucet, Etienne Save
1Laboratory of Neurobiology and Cognition, UMR 6155 CNRS, Université de Provence, pôle 3C, case C, 3 place Victor Hugo, 13331 Marseille cedex 3, France.
Behavioural Brain Research
|March 17, 2006
Summary
The hippocampus and entorhinal cortex cooperation is crucial for spatial memory, especially in object exploration tasks. Task demands modulate this hippocampo-cortical system
Area of Science:
- Neuroscience
- Cognitive Science
- Behavioral Neuroscience
Background:
- Previous research suggested hippocampo-cortical circuitry is not vital for spatial memory.
- Lesions in parahippocampal areas, including the entorhinal cortex, did not impair place learning in water maze tasks.
Purpose of the Study:
- To investigate the direct cooperation between the hippocampus and entorhinal cortex.
- To examine the role of this circuitry in two distinct spatial tasks: place navigation and spontaneous object exploration.
Main Methods:
- Utilized a disconnection procedure involving lesions to the entorhinal-hippocampal system in rats.
- Assessed performance in a place navigation task and a spontaneous object exploration task.
Main Results:
- Damage to the entorhinal-hippocampal system impaired performance in both spatial tasks.
- Rats with contralateral lesions showed greater deficits in the spatial object exploration task compared to ipsilateral lesions.
Conclusions:
- The cooperation between the hippocampus and entorhinal cortex is essential for spatial memory formation.
- The involvement of this hippocampo-entorhinal system is modulated by task type and cognitive demands.