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Related Experiment Videos

Local modulation of basal forebrain: effects on working and reference memory

B Givens1, D S Olton

  • 1Department of Psychology, Johns Hopkins University, Baltimore, Maryland 21218.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|June 1, 1994
PubMed
Summary

The medial septal area (MSA) regulates nonspatial working memory via hippocampal theta rhythm, while the nucleus basalis magnocellularis (NBM) is crucial for both working and reference memory functions.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Memory Research

Background:

  • The medial septal area (MSA) and nucleus basalis magnocellularis (NBM) are key brain regions implicated in memory processes.
  • Understanding their distinct and overlapping roles in different memory types is essential for elucidating mnemonic mechanisms.

Purpose of the Study:

  • To investigate the functional contributions of the MSA and NBM to working and reference memory.
  • To examine their involvement in spatial and nonspatial memory tasks.
  • To explore the neurochemical regulation and temporal dynamics of neural activity within these nuclei during memory processing.

Main Methods:

  • Rats were trained on continuous conditional discrimination (CCD) for working memory and CCD/sensory discrimination (SD) for reference memory tasks.

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  • Hippocampal EEG (theta rhythm) was monitored using bipolar electrodes.
  • Infusions of tetracaine, scopolamine, or muscimol into the MSA or NBM were administered prior to behavioral testing.

    • Main Results:

    • MSA infusions impaired nonspatial working memory (CCD accuracy) and reduced hippocampal theta power, with effects dose- and time-dependent.
    • MSA infusions did not affect reference memory in either CCD or SD tasks.
    • NBM infusions disrupted both working memory (CCD) and reference memory (SD), without impacting hippocampal theta.

    Conclusions:

    • Rhythmic septohippocampal activity reflects nonspatial working memory processing, modulated by the MSA.
    • The NBM plays a critical role in both working and reference memory, independent of hippocampal theta.
    • These findings delineate distinct roles for the MSA and NBM in memory systems.