Cognitive bias testing in pigs provides validated objective assessment of affective states, demonstrating that housing and management quality measurably affect whether pigs experience life positively or negatively.
Cognitive bias testing represents a methodological breakthrough in animal welfare assessment — the ability to objectively measure not just the absence of suffering but the presence of positive mental states using validated behavioral paradigms. The finding that pig housing quality produces measurable differences in cognitive bias demonstrates that the animals genuinely experience their environments as better or worse, not just that welfare scientists hypothesize they do. Pessimistic bias in barren housing is not just an indicator of poor welfare but evidence of subjective negative experience — the pigs are living in a state where they expect bad outcomes. Positive welfare requires not just preventing this but actively producing the enriched conditions that generate optimistic affective states.