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Spatial learning deficit after NMDA receptor blockade and state-dependency.

B D Kretschmer1, S Fink

  • 1Department of Neuropharmacology, University of Tübingen, Germany. beate.kretschmer@uni-tuebingen.de

Behavioural Pharmacology
|April 26, 2000
PubMed
Summary
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This study investigated state-dependent learning using dizocilpine (MK-801), an N-methyl-D-aspartate receptor antagonist. MK-801 impaired spatial memory acquisition but not recall, suggesting learning under blockade doesn't hinder performance in a drug-free state.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Pharmacology

Background:

  • N-methyl-D-aspartate (NMDA) receptors are crucial for synaptic plasticity and memory formation.
  • NMDA receptor antagonists, like dizocilpine (MK-801), are used to probe the role of these receptors in cognitive functions.
  • State-dependent learning refers to improved recall when the internal state during learning matches the state during retrieval.

Purpose of the Study:

  • To investigate whether spatial memory acquisition under NMDA receptor blockade is state-dependent.
  • To determine if learning with MK-801 impairs memory retrieval in a drug-free state.

Main Methods:

  • Rats were trained in an eight-arm radial maze after receiving dizocilpine (MK-801) or saline injections.
  • Training occurred over 9 days, followed by a 10th-day test involving state manipulation (MK-801 vs. saline).

Related Experiment Videos

  • Performance was assessed by analyzing spatial memory recall and acquisition, with motor activity monitored.

    • Main Results:

    • MK-801 administration impaired the acquisition of spatial memory, particularly working memory, but not reference memory.
    • Rats trained under MK-801 did not show impaired spatial memory recall when tested in a saline (drug-free) state.
    • Motor activity (speed) was significantly enhanced at both tested doses of MK-801.

    Conclusions:

    • Learning acquired under NMDA receptor blockade does not necessarily impede performance when the state changes to drug-free.
    • NMDA receptor antagonism primarily affects the encoding and consolidation phases of spatial memory rather than retrieval.
    • These findings contribute to understanding the complex role of NMDA receptors in memory processes and state-dependent learning.