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Related Experiment Videos

Selection for conditionability in Drosophila melanogaster.

K L Lofdahl1, M Holliday, J Hirsch

  • 1University of Illinois, Urbana-Champaign.

Journal of Comparative Psychology (Washington, D.C. : 1983)
|June 1, 1992
PubMed
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Researchers successfully bred fruit flies (Drosophila melanogaster) for learning abilities. Selective breeding significantly increased excitatory conditionability in one group and decreased it in another, demonstrating genetic control over learning.

Area of Science:

  • Behavioral Genetics
  • Neuroscience
  • Animal Behavior

Background:

  • Individual differences in learning and memory are crucial for understanding complex behaviors.
  • Drosophila melanogaster serves as a powerful model organism for genetic and behavioral studies.
  • Previous research highlighted the importance of reliable measures for assessing behavioral traits.

Purpose of the Study:

  • To investigate the genetic basis of excitatory conditionability in Drosophila melanogaster.
  • To establish a bidirectional selective breeding program for enhancing or reducing learning ability.
  • To differentiate conditioned responses from non-specific sensitization effects.

Main Methods:

  • Utilized reliable measures of individual differences in conditioning, as described by Holliday & Hirsch.

Related Experiment Videos

  • Conducted bidirectional selective breeding on 1,324 Drosophila melanogaster over multiple generations.
  • Assessed excitatory conditionability and measured the central excitatory state (sensitization) as a control.

    • Main Results:

    • Selective breeding for good conditioning increased the percentage of responsive flies from 19% to 77% over 25 generations.
    • Selective breeding for poor conditioning decreased the percentage of responsive flies to 0%-4% over 23 generations.
    • The enhanced conditioning in the selected population did not correlate with increased sensitization.

    Conclusions:

    • Excitatory conditionability in Drosophila melanogaster is amenable to significant genetic selection.
    • Bidirectional selective breeding effectively created distinct populations with high and low learning capacities.
    • The observed conditioning effects are specific and not merely a result of generalized arousal or sensitization.