Source: Maya Yang, THE GUARDIAN, 3/22/22

In the study published earlier this month, researchers from the University of Copenhagen, ETH Zurich and the French National Research Institute for Agriculture, Food and Environment recorded 7,414 sounds from 411 pigs in different scenarios. The researchers then developed an algorithm to decode whether pigs were experiencing a positive emotion, negative emotion or something in between. The recordings were collected in situations encountered by commercial pigs from birth to death, the University of Copenhagen said. Researchers also monitored behavior and heart rates.

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