Cognitive bias testing for positive and negative affective states in pigs provides an objective welfare assessment tool that goes beyond behavioral observations to reveal the underlying emotional state of farm animals.
Cognitive bias assessment represents one of the most sophisticated advances in farm animal welfare science. By presenting animals with ambiguous cues and measuring whether they respond as if expecting a positive or negative outcome, researchers can detect the underlying emotional state — the affective valence — that conventional welfare measures miss. A pig that systematically interprets uncertain situations negatively is in a chronic negative welfare state regardless of whether it shows obvious behavioral problems. This tool provides a window into animal minds that connects welfare science to the subjective experience that most people intuitively feel matters. Its development and application in farm settings is transforming how welfare is both assessed and understood.