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Related Concept Videos

Role of Hippocampus in Memory01:19

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: Jun 17, 2026

Assessment of Memory Function in Pilocarpine-induced Epileptic Mice
13:34

Assessment of Memory Function in Pilocarpine-induced Epileptic Mice

Published on: June 4, 2020

Object recognition memory and the rodent hippocampus.

Nicola J Broadbent1, Stephane Gaskin, Larry R Squire

  • 1Department of Psychiatry, University of California, La Jolla, California 92093, USA.

Learning & Memory (Cold Spring Harbor, N.Y.)
|December 24, 2009
PubMed
Summary
This summary is machine-generated.

The hippocampus is crucial for object recognition memory, as demonstrated by impaired performance in rats after hippocampal lesions. Memory deficits were observed when lesions occurred shortly after training, but not when delayed, highlighting the hippocampus's role.

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Last Updated: Jun 17, 2026

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Published on: June 4, 2020

Novel Object Recognition Test for the Investigation of Learning and Memory in Mice
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Published on: August 30, 2017

A Within-Subject Experimental Design using an Object Location Task in Rats
09:28

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Published on: May 6, 2021

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Animal Behavior

Background:

  • The novel object recognition task (NOR) is a standard method for evaluating recognition memory in rodents.
  • The specific brain structures essential for NOR task performance remain debated.
  • Understanding the hippocampus's role in memory is critical for cognitive neuroscience.

Purpose of the Study:

  • To investigate the anterograde and retrograde effects of hippocampal lesions on novel object recognition memory in rats.
  • To determine the temporal dependency of the hippocampus's involvement in object recognition memory.

Main Methods:

  • Rats underwent training on the NOR task with identical objects.
  • Bilateral hippocampal lesions or sham surgeries were performed at different time points (1 day, 4 weeks, or 8 weeks) after training.
  • Object recognition memory was assessed via retention tests conducted 2 weeks post-surgery, with additional postoperative tests using unique objects and a 3-hour delay.

Main Results:

  • Rats with hippocampal lesions 1 day or 4 weeks after training showed impaired object recognition memory.
  • Rats with hippocampal lesions 8 weeks after training performed similarly to control groups, preferring the novel object.
  • Subsequent postoperative tests confirmed that hippocampal lesions caused moderate and reliable memory impairments.

Conclusions:

  • The hippocampus plays a significant role in object recognition memory.
  • The findings suggest that the hippocampus is essential for memory consolidation or retrieval in the initial weeks following learning.