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Extensive training extends numerical abilities of guppies.

Angelo Bisazza1, Christian Agrillo, Tyrone Lucon-Xiccato

  • 1Department of General Psychology, University of Padova, Via Venezia 8, 35131, Padua, Italy.

Animal Cognition
|May 27, 2014
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Fish show surprising numerical cognition when given extensive training. This suggests that the cognitive differences between fish and mammals/birds may be smaller than previously believed, especially in numerical tasks.

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Area of Science:

  • Comparative cognition
  • Animal behavior
  • Neuroscience

Background:

  • Vertebrates exhibit varying numerical abilities, with mammals and birds outperforming fish in trained tasks.
  • Training duration is a potential factor influencing observed performance differences in numerical cognition.

Purpose of the Study:

  • To investigate the impact of extensive training on numerical discrimination in fish.
  • To test the hypothesis that shorter training periods underestimate fish numerical abilities.

Main Methods:

  • Female guppies underwent training on numerical discrimination tasks with increasing difficulty (2 vs. 3 to 5 vs. 6 items).
  • Subjects received up to 120 trials per discrimination, totaling thousands of trials per individual.
  • Performance was assessed against chance levels for each numerical contrast.

Main Results:

  • Five out of eight guppies successfully discriminated quantities up to 4 vs. 5 items.
  • This performance level significantly exceeds previous findings with limited training (e.g., 2 vs. 3 items).
  • The results indicate a higher capacity for numerical discrimination than previously reported for teleosts.

Conclusions:

  • Extended training significantly enhances numerical discrimination abilities in fish.
  • The gap in numerical cognition between teleosts and warm-blooded vertebrates may be less pronounced than commonly assumed.
  • Fish numerical cognition warrants further investigation with rigorous training protocols.