Activation of the phasic pontine-wave generator enhances improvement of learning performance: A mechanism for sleep-dependent plasticity

Vijayakumar Mavanji, Subimal Datta

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

The aim of this study was to test the hypothesis that supplementary activation of the phasic pontine wave (P-wave) generator during rapid eye movement (REM) sleep enhances consolidation and integration of memories, resulting in improved learning. To test this hypothesis, two groups of rats were trained on a two-way active avoidance learning task in the morning. Immediately after training, one group of rats received a carbachol microinjection into the P-wave generator and the other group was microinjected with control saline into the same target area. After training trials and microinjections, rats were allowed a 6-h period of undisturbed sleep in the polygraphic recording chamber. At the end of 6h of undisturbed sleep-wake recordings, rats were retested in a session of avoidance learning trials. After learning trials, the total percentage of time spent in REM sleep was significantly increased in both saline (15.36%)- and carbachol (17.70%)-microinjected rats. After learning trials, REM sleep P-wave density was significantly greater throughout the 6-h period of recordings in carbachol treated rats than in the saline treated rats. In the retrial session, the improvement in learning task performance was 22.75% higher in the carbachol-microinjected rats than in the saline-microinjected rats. These findings show that the consolidation and integration of memories create a homeostatic demand for P-waves. In addition, these findings provide experimental evidence, for the first time, that activation of the P-wave generator may enhance consolidation and integration of memories, resulting in improved performance on a recently learned task.

Original languageEnglish (US)
Pages (from-to)359-370
Number of pages12
JournalEuropean Journal of Neuroscience
Volume17
Issue number2
DOIs
StatePublished - Jan 2003
Externally publishedYes

Keywords

  • Active avoidance learning
  • Carbachol
  • Locus subcoeruleus
  • Rat
  • REM sleep

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