Cognitive bias testing has become the gold standard for measuring positive emotional states in pigs — the methodology is transforming farm animal welfare science.
Cognitive bias testing has transformed farm animal welfare science by providing a methodology for measuring the valence of emotional states — not just behavior, but the underlying psychological disposition. The finding that enriched pigs are more optimistic than barren-housed pigs is a landmark result: it demonstrates that the welfare gap between enriched and conventional housing is not just behavioral but emotional. The practical challenge is implementing cognitive bias assessment at farm level — the training protocols used in research settings are time-intensive. Research into simpler proxy measures that correlate with cognitive bias scores would enable wider adoption as a practical welfare monitoring tool. The methodology's influence on farm welfare science extends well beyond pig research, having inspired parallel work across multiple farm species.