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Related Experiment Videos

Sequential modification of membrane currents with classical conditioning.

C Collin1, H Ikeno, J F Harrigan

  • 1Section on Neural Systems, National Institute of Neurological and Communicative Disorders and Stroke, Bethesda, Maryland 20892.

Biophysical Journal
|November 1, 1988
PubMed
Summary
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Pavlovian conditioning modifies calcium (Ca2+) currents in Hermissenda crassicornis, alongside previously observed potassium (K+) current changes. These Ca2+ current alterations, linked to associative learning, may regulate neural excitability.

Area of Science:

  • Neuroscience
  • Cellular Neuroscience
  • Learning and Memory

Background:

  • Pavlovian conditioning in Hermissenda and rabbits reduces K+ currents.
  • Previous research focused on K+ current modifications following associative learning.

Purpose of the Study:

  • To investigate the impact of conditioning on Ca2+ currents.
  • To determine if Ca2+ currents are altered by associative learning and training intensity.

Main Methods:

  • Pavlovian conditioning procedures applied to Hermissenda crassicornis.
  • Electrophysiological measurements of K+ and Ca2+ currents in Type B photoreceptor soma.
  • Comparison of current changes after conditioning versus control procedures.

Main Results:

Related Experiment Videos

  • Conditioning reduces Ca2+ current amplitude, not voltage-dependence, for 1-2 days.
  • Changes in both K+ and Ca2+ currents correlate with training extent.
  • Significant Ca2+ current modification requires at least 250 training trials.

Conclusions:

  • Associative learning modifies both K+ and Ca2+ currents in Hermissenda.
  • Ca2+ current changes may serve to modulate excitability increases resulting from learning.
  • The study provides evidence for Ca2+ current plasticity in response to conditioning.