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Related Concept Videos

Long-Term Memory01:18

Long-Term Memory

Long-term memory is a relatively permanent type of memory, capable of storing vast amounts of information over extended periods. Its storage capacity is generally considered unlimited.
Long-term memory can be categorized into two primary types: explicit and implicit memory. Explicit memory, also known as declarative memory, involves the conscious recollection of information that we deliberately try to remember, recall, and articulate. This type of memory encompasses specific facts, events, and...

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Simultaneous Monitoring of Wireless Electrophysiology and Memory Behavioral Test as a Tool to Study Hippocampal Neurogenesis
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A novel, rapidly acquired and persistent spatial memory task that induces immediate early gene expression.

Lisa A Feldman1, Matthew L Shapiro, Josephine Nalbantoglu

  • 1Department of Neurology and Neurosurgery, McGill University and Montreal Neurological Institute, Montreal, Quebec H3A2B4, Canada.

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Summary

A condensed Morris water maze task rapidly trains rats in 15 minutes, creating lasting spatial memories and hippocampal gene expression crucial for learning.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Behavioral Neuroscience

Background:

  • The Morris water maze is a standard hippocampus-dependent test for spatial learning and memory.
  • Traditional protocols require extensive training (3 days to 2 weeks), hindering rapid assessment of learning acquisition.
  • This task is vital for understanding hippocampus-dependent learning and memory mechanisms.

Purpose of the Study:

  • To develop a condensed Morris water maze protocol for rapid spatial learning and memory assessment.
  • To investigate the time course of learning acquisition and memory retention in a shortened paradigm.
  • To examine hippocampus-dependent gene expression following learning in the condensed task.

Main Methods:

  • A novel paradigm interspersed visible and hidden platform trials in a massed training format, completing in under 15 minutes.
  • Learning was evaluated by platform latencies and goal quadrant exploration during probe tests at 30 minutes and 24 hours post-training.
  • Hippocampal gene expression was quantified using real-time polymerase chain reaction (RT-PCR) in normal and impaired rat cohorts (fimbria-fornix lesions, CPP administration).

Main Results:

  • Massed training with alternating trials successfully generated robust short-term working and long-term reference memories in rats.
  • Hippocampal function is critical, as evidenced by the failure of lesioned or pharmacologically impaired rats to learn the task.
  • The condensed task induced hippocampal expression of learning-associated genes, including homer1a, cfos, and zif268.

Conclusions:

  • A condensed Morris water maze protocol significantly reduces training time to 15 minutes while maintaining hippocampus-dependent spatial memory.
  • This rapid paradigm induces spatial memory lasting at least 24 hours and elicits the expression of key learning genes in the hippocampus.
  • The condensed task offers a more efficient method for studying spatial learning, memory, and associated molecular mechanisms.