According to a recent study in Science, pigs are providing convincing new evidence that animals may respond emotionally to music. The finding may lead to ways to improve their welfare on farms. "It's a really neat study that shows animals are more emotionally attuned (音感好的) to music than people think", says Charles Snowdon, an animal behaviour expert at the University of Wisconsin.
Music is sometimes used as enrichment for animals and other captive animals. And Snowball the dancing cockatoo (凤头鹦鹉) likes to dance to the Backstreet Boys. But whether these creatures have a true emotional response to the tunes is unclear. That's what the new study aimed to do — but with pigs. Coauthor Maria Camila Ceballos, an animal welfare scientist, says she chose these animals because they are intelligent and social, and face serious welfare challenges on factory farms.
The researchers composed music that were either consonant or dissonant. To humans, consonant music generally sounds pleasant whereas dissonance tends to sound uncomfortable. The team then filmed six litters of young pigs listening to the music, which was played in a random order with a break in between.
The researchers scored the pigs' body language using an approach called QBA. Pieces of consonant music were linked to the pigs experiencing positive emotions, whereas the dissonant music was linked to negative emotions, the team reports this month in Scientific Reports. "So we found that, yes, music generates different emotions," Ceballos says.
Animal welfare scientist Jun Bao from a university in China is skeptical about whether Ceballos's team detected emotions, however. He recently found that exposure to music increases play and tail wagging in pigs, which he sees as signs of a "positive mood". However, he says it's not clear that pigs labeled as "happy" or "uneasy" through QBA actually experience those emotions.
Ceballos hopes the study will help researchers create welfare-improving music, tailor-made to a specific species. Bao also agrees, adding "It's really interesting, because if it works, it would be the handiest and cheapest way to enrich their environment."
