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Related Experiment Videos

Matching-to-sample and oddity-from-sample in goldfish.

M Goldman, S Shapiro

    Journal of the Experimental Analysis of Behavior
    |March 1, 1979
    PubMed
    Summary
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    Goldfish demonstrated the ability to learn complex discrimination tasks, including matching-to-sample and oddity-from-sample. Performance improved over time, showing that goldfish can learn tasks where reinforcement depends on stimulus identity.

    Area of Science:

    • Comparative psychology
    • Animal cognition
    • Behavioral neuroscience

    Background:

    • Simultaneous discrimination tasks, such as matching-to-sample and oddity-from-sample, are crucial for understanding learning processes.
    • Investigating these tasks in non-primate species like goldfish provides insights into the evolution of cognitive abilities.

    Purpose of the Study:

    • To investigate the acquisition of three-alternative simultaneous matching-to-sample and oddity-from-sample tasks in goldfish.
    • To compare the learning rates and performance levels between the two tasks.
    • To examine the effects of task order on acquisition and performance.

    Main Methods:

    • Five goldfish were trained on matching-to-sample, and five on oddity-from-sample, for at least 70 days.
    • Six fish were subsequently trained on the alternative task for 70 days.

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  • Performance was measured by the percentage of correct responses, starting from chance levels.

    • Main Results:

    • Acquisition rates for both oddity and matching tasks were similar, with performance increasing from chance to approximately 75-85%.
    • Learning the second task (oddity after matching, or matching after oddity) initially occurred below chance levels.
    • While second-task oddity performance matched first-task matching, second-task matching performance was lower than first-task oddity performance.
    • Goldfish showed strong color preferences during matching acquisition but not during oddity acquisition.

    Conclusions:

    • Goldfish can acquire complex simultaneous discrimination tasks.
    • The order of task acquisition influences performance, with oddity potentially being a more robust task for goldfish.
    • The findings suggest that goldfish can learn conditional discriminations where reinforcement is contingent on stimulus identity.