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The magnocellular mediodorsal thalamus is necessary for memory acquisition, but not retrieval

Anna S Mitchell1, David Gaffan

  • 1Department of Experimental Psychology, Oxford University, Oxford OX1 3UD, United Kingdom. anna.mitchell@psy.ox.ac.uk

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 4, 2008
PubMed

Insights

The magnocellular mediodorsal thalamic nucleus (MDmc) is crucial for acquiring new memories, but not for recalling or retaining existing ones. This study demonstrates its specific role in memory formation.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Memory Research

Background:

  • Damage to the magnocellular mediodorsal thalamic nucleus (MDmc) is linked to amnesia.
  • The precise role of MDmc in memory acquisition versus retrieval remains unclear.

Purpose of the Study:

  • To investigate the specific role of the MDmc in memory acquisition and retrieval.
  • To determine if MDmc is essential for forming new memories or accessing existing ones.

Main Methods:

  • Selective neurotoxic lesions of the MDmc were created in rhesus monkeys.
  • Monkeys were tested on memory retention (preoperative retrieval) and acquisition (postoperative learning) of scene discriminations.

Main Results:

  • MDmc lesions did not impair performance in a one-trial retrieval test for previously learned tasks.
  • New learning of novel scene discriminations was significantly impaired after MDmc lesions.

Conclusions:

  • The MDmc is essential for the acquisition of new memories, specifically for learning new scene discriminations.
  • The MDmc is not required for the retention or retrieval of previously acquired memories.

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