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Quantity discrimination by zebrafish (Danio rerio).

Davide Potrich1, Valeria Anna Sovrano1, Gionata Stancher1

  • 1Center for Mind/Brain Sciences, University of Trento.

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Summary

Zebrafish can discriminate between different quantities of remembered social stimuli. Their ability to distinguish numerical magnitude depends on the ratio between groups, indicating an approximate number system.

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Area of Science:

  • Comparative psychology
  • Neuroscience
  • Ethology

Background:

  • The ability to discriminate numerical quantities is fundamental to survival.
  • Investigating numerical cognition in non-human animals provides insights into the evolution of this capacity.
  • Zebrafish (Danio rerio) offer a tractable model for studying complex cognitive processes.

Purpose of the Study:

  • To investigate the capacity of zebrafish to discriminate between different quantities of memorized social stimuli.
  • To determine the numerical limits and precision of quantity discrimination in zebrafish.

Main Methods:

  • Male zebrafish were presented with two groups of female conspecifics of varying numerical differences.
  • After the stimuli were removed, zebrafish behavior was recorded to assess their choice of approaching the location previously occupied by the larger group.
  • Tests involved numerical sets such as 1 vs. 2, 2 vs. 3, 3 vs. 4, 2 vs. 4, 4 vs. 6, 4 vs. 8, and 6 vs. 8.

Main Results:

  • Zebrafish successfully discriminated between quantities in sets like 1 vs. 2, 2 vs. 3, 2 vs. 4, 4 vs. 6, and 4 vs. 8.
  • Performance declined with increasing numerical set sizes, with failures observed in 3 vs. 4 and 6 vs. 8 comparisons.
  • Success was correlated with the ratio between the numerical sets, suggesting a Weber's law-like principle.

Conclusions:

  • Zebrafish possess an approximate number system for discriminating memorized quantities of social stimuli.
  • The precision of quantity discrimination is dependent on the ratio between the set sizes.
  • These findings contribute to understanding numerical cognition in fish and its evolutionary underpinnings.