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Stimulus generalization, discrimination learning, and peak shift in horses.

D M Dougherty1, P Lewis

  • 1Department of Psychology, Ohio University, Athens 45701.

Journal of the Experimental Analysis of Behavior
|July 1, 1991
PubMed
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Horses learned to press a lever when shown a specific circle size. Discrimination training led to peak shift, demonstrating stimulus control principles in equine behavior.

Area of Science:

  • Comparative psychology
  • Animal behavior
  • Behavioral neuroscience

Background:

  • Stimulus control is fundamental to understanding learned behaviors.
  • Investigating stimulus generalization, discrimination learning, and peak shift provides insights into cognitive processes.
  • Horses offer a unique model for studying these behavioral principles.

Purpose of the Study:

  • To investigate stimulus generalization, discrimination learning, and peak shift in horses.
  • To examine how different training orders affect behavioral outcomes.
  • To compare equine learning with that of other laboratory organisms.

Main Methods:

  • Horses were trained to press a lever using successive approximations with a positive stimulus (2.5-in. circle).
  • Stimulus generalization gradients were collected before and after discrimination training.

Related Experiment Videos

  • Discrimination training involved differential reinforcement between a positive (2.5-in.) and negative (1.5-in.) stimulus.

    • Main Results:

    • Horses rapidly acquired lever-pressing behavior, comparable to other species.
    • Pre-discrimination generalization testing resulted in symmetrical gradients.
    • Post-discrimination testing showed asymmetrical gradients with a peak shift away from the negative stimulus.

    Conclusions:

    • The study demonstrates stimulus control of behavior in horses.
    • Findings align with established principles of stimulus generalization, discrimination learning, and peak shift.
    • Horses exhibit complex learning capabilities comparable to other model organisms.