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Large number discrimination by mosquitofish.

Christian Agrillo1, Laura Piffer, Angelo Bisazza

  • 1Department of General Psychology, University of Padova, Padova, Italy. christian.agrillo@unipd.it

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Summary
This summary is machine-generated.

Fish can distinguish large quantities, similar to humans, using pure numerical information. Their numerical system shows no upper limit, but ratio affects performance, suggesting a common vertebrate origin for numerical cognition.

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Area of Science:

  • Comparative Cognition
  • Animal Behavior
  • Neuroscience

Background:

  • Recent research indicates fish possess basic numerical abilities comparable to mammals and birds.
  • While small quantity discrimination (<4) in fish is understood, large numerosity discrimination remains unexplored.

Purpose of the Study:

  • To investigate fish's ability to discriminate large quantities.
  • To determine if fish utilize pure numerical information or rely on continuous variables.
  • To explore the impact of numerical ratio on discrimination performance.

Main Methods:

  • Mosquitofish were trained using social reinforcement to discriminate between sets of geometric figures.
  • Experiments controlled for continuous variables (area, density, luminance) and manipulated numerical ratios.
  • Human performance was assessed non-verbally using identical stimuli for comparison.

Main Results:

  • Fish successfully discriminated large quantities (e.g., 100 vs. 200 objects) without performance decline.
  • Fish can utilize pure numerical information but may use area as a proxy if available.
  • Performance decreased with smaller numerical ratios (e.g., 3:4), with human performance overlapping fish capabilities.

Conclusions:

  • Fish demonstrate the capacity for pure numerical discrimination of large quantities (>4).
  • Fish numerical systems appear to lack an upper limit, similar to primates, with ratio significantly impacting performance.
  • Findings support a shared evolutionary basis for non-verbal numerical cognition across vertebrates.