The parafascicular nucleus and two-way active avoidance: Effects of electrical stimulation and electrode implantation

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Abstract

To evaluate whether electrical stimulation of the parafascicular nucleus (PF) can improve short-term (24 h) and/or long-term (21 days) retention of two-way active avoidance, rats were implanted with an electrode at this nucleus (experimental groups) or above it (control groups). After a single 30-trial acquisition session, experimental groups were submitted to a 10-min session of electrical stimulation. Results showed that the simple implantation of an electrode at the posterior PF enhanced by itself the acquisition of two-way active avoidance, in such a way that the subsequent stimulation of this region may have been unable to further improve the performance of the rats. On the other hand, parafascicular stimulation improved the 24-h retention of the task in a site-specific way, since this effect was mainly seen after stimulation of the central PF region. The facilitative effect on 24-h retention could also depend on the level of performance achieved during the acquisition session, because this improvement was only evidenced in poorly learning animals. No effects were found on 21-day retention. The present results confirm the involvement of the PF in learning and memory and the functional heterogeneity of this nucleus.
Original languageEnglish
Pages (from-to)605-614
JournalExperimental Brain Research
Volume129
Issue number4
DOIs
Publication statusPublished - 21 Dec 1999

Keywords

  • Electrical stimulation
  • Learning and memory
  • Parafascicular thalamic nucleus
  • Rat
  • Two-way active avoidance

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