Long-term potentiation in the dentate gyrus is induced preferentially on the positive phase of theta-rhythm

Brain Res. 1988 Jan 26;439(1-2):383-7. doi: 10.1016/0006-8993(88)91499-0.


Long-term potentiation (LTP), a long lasting enhancement of synaptic efficacy is considered a model for learning and memory. In anesthetized rats, theta-rhythm was induced in the dentate gyrus by midbrain stimulation. Short trains of pulses were applied to the perforant pathway either at the peak of theta-rhythm or its trough. Trains applied at the peak of theta-rhythm induced LTP while trains applied at the trough produced a decrease of synaptic efficacy or had no effect. Thus, theta-rhythm may play a modulating role in the induction of LTP, suggesting a possible mnemonic function for the rhythm during the behaviors in which it occurs.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Electric Stimulation
  • Electroencephalography*
  • Evoked Potentials
  • Hippocampus / physiology*
  • Mesencephalon / physiology
  • Rats
  • Synapses / physiology
  • Theta Rhythm*