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Low-threshold N-methyl-D-aspartate receptor function correlates negatively with learning.

P M Bradley1, B D Burns, A C Webb

  • 1Department of Neurobiology, Medical School, University of Newcastle upon Tyne, NE2 4HH, Newcastle upon Tyne, UK.

Brain Research
|April 28, 2001
PubMed
Summary
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Young chicks (3–4 days old) show the most effective reversal learning, linked to brain plasticity in the intermediate, medial hyperstriatum ventrale (IMHV). This learning is inversely related to N-methyl-D-aspartate receptor function.

Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Animal Behavior

Background:

  • The intermediate, medial hyperstriatum ventrale (IMHV) in domestic chicks is a highly plastic forebrain region.
  • Plasticity in the IMHV is strongly associated with behavioral changes.
  • Physiological properties of the IMHV are age-dependent, with peak plasticity observed in 3- to 4-day-old birds.

Purpose of the Study:

  • To investigate the relationship between age-dependent plasticity in the IMHV and the effectiveness of behavioral reversal training.
  • To explore the role of N-methyl-D-aspartate (NMDA) receptors in this age-related learning phenomenon.

Main Methods:

  • In vivo training of domestic chicks.
  • In vitro electrophysiology on IMHV slices.
  • Correlation analysis between behavioral training outcomes and receptor function.

Related Experiment Videos

Main Results:

  • Reversal training was most effective in 3- and 4-day-old chicks, confirming a critical developmental window.
  • The function of low-threshold N-methyl-D-aspartate receptors was negatively correlated with the effectiveness of reversal training, even when age was controlled.

Conclusions:

  • The effectiveness of behavioral reversal learning in chicks is strongly influenced by age-related changes in IMHV plasticity.
  • NMDA receptor function is a key factor modulating the efficacy of learning during this critical developmental period.