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Related Experiment Video

Updated: Aug 6, 2025

The Use of the Puzzle Box as a Means of Assessing the Efficacy of Environmental Enrichment
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Environment Enrichment Facilitates Long-Term Memory Consolidation through Behavioral Tagging.

Medha Kaushik1, Pooja Kaushik1, Siddharth Panwar2

  • 1Department of Toxicology, School of Chemical and Life Sciences, New Delhi 110062, India.

Eneuro
|March 20, 2023
PubMed
Summary

Environment enrichment (EE) effectively consolidates long-term memory (LTM) via behavioral tagging (BT), enhancing protein kinase Mζ (PKMζ) in the hippocampus. Open field (OF) exploration did not show similar molecular effects.

Keywords:
PKMζlong-term memorynovel object recognitionnovelty exposureplasticity-related proteins

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Molecular Biology

Background:

  • The behavioral tagging (BT) hypothesis explains long-term memory (LTM) consolidation, where novelty exposure activates memory formation.
  • Previous studies on BT primarily used open field (OF) exploration for novelty.
  • Environment enrichment (EE) is known to enhance cognition, LTM, and synaptic plasticity.

Purpose of the Study:

  • To investigate the impact of different novelty types (OF vs. EE) on LTM consolidation and plasticity-related protein (PRP) synthesis within the BT framework.
  • To compare the molecular effects of EE and OF exposure on specific proteins in the rat hippocampus.

Main Methods:

  • Utilized the novel object recognition (NOR) task for learning in male Wistar rats.
  • Introduced two distinct novelty conditions: open field (OF) exploration and environment enrichment (EE).
  • Assessed LTM consolidation and measured the synthesis of protein kinase Mζ (PKMζ) and BDNF in the hippocampus.

Main Results:

  • Environment enrichment (EE) exposure significantly facilitated LTM consolidation through the BT phenomenon.
  • EE significantly increased PKMζ synthesis in the hippocampus, whereas OF exposure did not.
  • No significant alterations in BDNF expression were observed in the hippocampus after either EE or OF exposure.

Conclusions:

  • Different types of novelty can mediate the behavioral tagging phenomenon similarly at the behavioral level.
  • However, the molecular implications of distinct novelty experiences, such as EE versus OF, can differ significantly.
  • EE enhances LTM consolidation potentially through increased PKMζ synthesis in the hippocampus.