Cognitive Bias Tests as Welfare Indicators

Judgment bias testing reveals whether animals are experiencing positive or negative affective states.

Key Facts

Animals in negative affective states make more pessimistic decisions in ambiguous situations
Judgment bias tests have been validated in pigs, rats, dogs, sheep, and other species
Positive welfare states produce optimistic judgment biases — animals expect good outcomes
This behavioral test allows welfare assessment without relying on physiological stress indicators alone

Welfare Considerations

Judgment bias testing represents a breakthrough in welfare science — a behavioral test that reveals the emotional state of animals. In a typical test, animals learn that one stimulus predicts reward and another predicts an aversive outcome. When presented with an ambiguous stimulus between the two, animals in positive affective states respond optimistically (expecting reward), while those in negative states respond pessimistically. This test has been validated across multiple species and provides a window into subjective animal experience that complements physiological measures.

What You Can Do

Support research applying judgment bias testing to farm and companion animals
Advocate for welfare assessment methods that measure subjective experience
Engage with the science of animal affect and its welfare implications
Support welfare programs informed by cognitive bias research findings