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Related Experiment Video

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Reproductive Techniques for Ovarian Monitoring and Control in Amphibians

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Published on: May 12, 2019

Numerical discrimination by frogs (Bombina orientalis).

G Stancher¹, R Rugani, L Regolin

¹Center for Mind/Brain Sciences, University of Trento, Rovereto, Trento, Italy, gionata.stancher@unitn.it.

Animal Cognition

|August 11, 2014

Summary

Frogs can discriminate between different quantities of prey, showing sensitivity to number. This ability is evident even when controlling for physical variables, particularly for small numbers, suggesting distinct processing for small and large quantities.

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Area of Science:

Comparative psychology
Animal behavior
Sensory processing

Background:

Quantity discrimination is documented in mammals and birds, but less so in amphibians.
For amphibians, it's unclear if quantity discrimination relies on number or physical variables.
Investigating numerical cognition in amphibians like frogs is crucial for understanding the evolution of number sense.

Purpose of the Study:

To investigate quantity discrimination in frogs (Bombina orientalis).
To determine if frogs distinguish prey quantity based on number or continuous physical variables.
To explore potential differences in processing small versus large quantities.

Main Methods:

Free-choice experiments were conducted with Bombina orientalis.
Frogs were presented with varying amounts of Tenebrio molitor larvae.
Systematic controls were implemented for prey surface area, volume, weight, and movement.

Main Results:

Frogs demonstrated quantity discrimination for small numerousness (1 vs. 2, 2 vs. 3) and large numerousness (3 vs. 6, 4 vs. 8).
Clear evidence suggests numerical discrimination in small quantities (1 vs. 2) even when physical variables were controlled.
For large quantities, dominance of number versus surface area remained ambiguous.

Conclusions:

Frogs exhibit quantity discrimination abilities, suggesting a capacity for numerical processing.
Task demands likely influence distinct processing systems for small and large numerousness.
The susceptibility to continuous variables varies between small and large quantity discrimination tasks.