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Does the stimulus type influence horses' performance in a quantity discrimination task?

Yuki Henselek¹, Julia Fischer, Christian Schloegl

¹Cognitive Ethology Laboratory, German Primate Center Göttingen, Germany.

Frontiers in Psychology

|November 28, 2012

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Horses showed weak quantity discrimination skills, unlike primates. Experimental conditions significantly influence cognitive test outcomes in animals.

Area of Science:

Comparative cognition
Animal behavior
Numerical cognition

Background:

Quantity discrimination is common across species, typically tested via larger quantity choices.
Errors in simple discriminations suggest potential issues with testing procedures, particularly stimulus-reward associations.

Purpose of the Study:

To investigate if quantity discrimination performance in horses is affected by testing procedures, similar to findings in primates.
To assess quantity discrimination abilities in Icelandic horses, a non-primate species distantly related to monkeys.

Main Methods:

Replicated a primate study on quantity discrimination with 12 Icelandic horses.
Presented horses with choices between different quantities of items, varying stimulus and reward types.
Analyzed performance in discriminating between quantities, focusing on the larger quantity choice.

Keywords:

edible reward horses inedible reward quantity discrimination stimulus type

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Main Results:

Horses exhibited only weak evidence for quantity discrimination skills.
No significant effect of stimulus type (edible vs. inedible) on performance was observed.
Performance varied, with only some horses reliably choosing the larger quantity in specific pairs.

Conclusions:

Quantity discrimination may be of minor importance for Icelandic horses.
Experimental conditions significantly influence the results of cognitive tests in animals.
Findings contrast with previous studies in primates and other horse studies, highlighting species-specific cognitive abilities and methodological impacts.