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Related Experiment Videos

Learning with half a brain.

David D Lent1, Marianna Pintér, Nicholas J Strausfeld

  • 1Arizona Research Laboratories Division of Neurobiology, The University of Arizona, Tucson, Arizona, USA. dlent@u.arizona.edu

Developmental Neurobiology
|April 20, 2007
PubMed
Summary
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Cockroaches exhibit hemisphere-specific learning by extending antennae towards a light after odor pairing. This demonstrates that learning-associated neural changes occur within a single brain hemisphere, even in insects.

Area of Science:

  • Neuroscience
  • Animal Behavior
  • Cognitive Science

Background:

  • Corpus callosotomy in humans has revealed hemisphere-specific functions.
  • Investigating cognitive processes in isolated brain hemispheres offers unique research advantages.
  • Previous studies on isolated hemisphere function were limited to mammals.

Purpose of the Study:

  • To investigate hemisphere-specific learning in an insect model.
  • To demonstrate learning-associated neural changes within a single brain hemisphere.
  • To explore the potential of insect brains for studying cognition.

Main Methods:

  • Bisecting cockroach brains to isolate hemispheres.
  • Training one hemisphere of the bisected brain with an odor-light association.

Related Experiment Videos

  • Observing antenna extension responses to a light stimulus.
  • Analyzing post-translational alterations in the mushroom body calyces of the trained hemisphere.

    • Main Results:

    • Cockroaches learned to extend the antenna associated with the trained hemisphere towards a light stimulus.
    • The antenna of the untrained hemisphere showed no learned response.
    • This learning was retained for up to 24 hours.
    • Specific synaptic alterations were observed in the mushroom body calyces of the trained hemisphere post-training.

    Conclusions:

    • Insect brains, like mammalian brains, can exhibit hemisphere-specific learning.
    • Learning induces localized neural changes within a single brain hemisphere.
    • The cockroach serves as a viable model for studying isolated brain hemisphere functions and learning mechanisms.