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Role of Hippocampus in Memory

Role of Hippocampus in Memory

The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...

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Related Experiment Video

Updated: Jul 9, 2026

The Double-H Maze: A Robust Behavioral Test for Learning and Memory in Rodents

The Double-H Maze: A Robust Behavioral Test for Learning and Memory in Rodents

Published on: July 8, 2015

Hippocampal endocannabinoids inhibit spatial learning and limit spatial memory in rats.

Lianne Robinson¹, Susan McKillop-Smith, Nicola L Ross

¹School of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, UK.

Psychopharmacology

|December 1, 2007

Summary

Cannabinoid antagonist Rimonabant (SR141716A) impaired spatial learning when given systemically, but enhanced memory when infused intrahippocampally, suggesting selective CB1 receptor blockade may improve memory.

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Last Updated: Jul 9, 2026

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Motor and Hippocampal Dependent Spatial Learning and Reference Memory Assessment in a Transgenic Rat Model of Alzheimer's Disease with Stroke

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Published on: March 22, 2016

Area of Science:

Neuroscience
Pharmacology
Cognitive Science

Background:

Exogenous cannabinoid agonists are known to impair memory formation.
This raises the question of whether cannabinoid antagonists could have opposing, memory-enhancing effects.

Purpose of the Study:

To investigate the effects of the cannabinoid antagonist SR141716A (Rimonabant) on spatial learning and memory.
To explore the role of hippocampal CB(1) receptors in these effects.

Main Methods:

Spatial learning and memory were assessed using the water maze task.
SR141716A was administered systemically (intraperitoneally, subcutaneously) or intrahippocampally via minipumps.
Different administration timings (pre-training, post-training, during learning) were employed.

Main Results:

Systemic SR141716A administration before training impaired spatial learning and increased anxiety-related behaviors (thigmotaxis).
Intrahippocampal infusion of SR141716A during training enhanced acquisition but not long-term consolidation.
Post-training intrahippocampal infusion did not affect reversal learning but enhanced short-term memory and long-term memory for the reversal platform.

Conclusions:

Systemic Rimonabant's negative effects on memory are likely due to its anxiogenic properties.
Selective blockade of hippocampal CB(1) receptors may enhance certain aspects of memory formation and recall.