Research into pig cognition has revealed sophisticated cognitive and emotional capacities that have profound implications for how we treat pigs in farming contexts.
Pig intelligence research has produced findings that, taken seriously, fundamentally challenge the ethical status of modern pig farming practices. A species capable of playing video games, recognizing mirrors as reflections, showing empathic responses to pen mates' distress, and demonstrating optimism bias has a rich inner life that is profoundly compromised by barren, crowded confinement. The emotional contagion research - pigs showing agitation when pen mates are distressed - means that stress in one pig propagates through a group, creating welfare cascades in poorly managed systems. Cognitive bias research has documented that pigs in poor welfare conditions show pessimistic judgment patterns compared to those in enriched environments, providing objective evidence that subjective emotional states track environmental quality. These findings argue for welfare standards that acknowledge pigs as sentient, intelligent beings rather than meat-producing machines.