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Related Experiment Videos

Cortical map reorganization enabled by nucleus basalis activity

M P Kilgard1, M M Merzenich

  • 1Department of Otolaryngology, W. M. Keck Foundation Center for Integrative Neuroscience, University of California, San Francisco, 513 Parnassus Avenue, Box 0732, San Francisco, CA 94143, USA.

Science (New York, N.Y.)
|March 28, 1998
PubMed
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The basal forebrain instructs the cortex to prioritize important sensory information. Nucleus basalis stimulation reshapes auditory cortex representations, mimicking effects of behavioral training.

Area of Science:

  • Neuroscience
  • Auditory Cortex Plasticity
  • Neuromodulation

Background:

  • Mechanisms for selective neural representation of important stimuli remain unclear.
  • Neuromodulatory systems may guide cortical plasticity by marking salient inputs.

Purpose of the Study:

  • To investigate the role of the basal forebrain in driving cortical plasticity.
  • To determine if nucleus basalis activation can reorganize the primary auditory cortex.

Main Methods:

  • Episodic electrical stimulation of the rat nucleus basalis paired with auditory stimuli.
  • Analysis of receptive field changes in the primary auditory cortex.

Main Results:

  • Nucleus basalis activation caused significant reorganization of the primary auditory cortex.

Related Experiment Videos

  • Receptive field properties (size) were altered (narrowed or broadened) based on acoustic stimulus parameters.
  • Plasticity observed mimicked receptive field changes seen with behavioral training.

    • Conclusions:

    • The basal forebrain plays an active instructional role in representational plasticity.
    • Auditory cortex receptive field alterations can be driven by input characteristics, independent of explicit task knowledge.