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Numerical discrimination in Danionella.

Mirko Zanon^1,2, Scott E Fraser^2,3,4, Giorgio Vallortigara¹

¹Centre for Mind/Brain Sciences, University of Trento, Rovereto, Italy.

|October 27, 2025

Summary

This summary is machine-generated.

The transparent fish Danionella cerebrum demonstrates quantity discrimination abilities. This finding expands understanding of fish cognition and supports its use in neuroscience research.

Keywords:

Cognitive neuroscience Neuroscience Techniques in neuroscience

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Area of Science:

Neuroscience
Animal Cognition
Ichthyology

Background:

Danionella cerebrum, a transparent teleost, is valuable for neuroscience due to its small size, cranial transparency, and simple brain.
Its cognitive abilities, however, are not well understood.

Purpose of the Study:

To investigate the quantity discrimination capabilities of Danionella cerebrum.
To assess if Danionella cerebrum can distinguish between different numerical quantities.

Main Methods:

A habituation/dishabituation paradigm was employed over six trials across five days.
Fish were exposed to dot arrays with constant numerosity, while visual properties were varied.
Numerical discrimination was tested by presenting a novel numerosity in the final trial.

Main Results:

Danionella cerebrum exhibited significant dishabituation when presented with a different numerosity.
Fish spent more time near the stimulus with altered numerical information, indicating quantity discrimination between 3 and 9 elements.

Conclusions:

Danionella cerebrum possesses the ability to discriminate between quantities.
These findings enhance the understanding of Danionella cerebrum's cognitive functions.
This supports its broader application in high-resolution research on the neural basis of cognition.