The new study shows that fish can detect fear in other fish, and then become afraid too – and that this ability is regulated by oxytocin, the same brain chemical that underlies the capacity for empathy in humans.
In this photo provided by researcher Rui F. Oliveira, a zebrafish, bottom, is monitored to see its reaction to a video of another at a laboratory in Oeiras, Portugal in March 2023. A study published on Thursday, March 23, 2023, in the journal Science shows that a relaxed fish can detect fear in other fish, and then become afraid itself and that this ability is regulated by oxytocin, the same brain chemical that underlies the capacity for empathy in humans.
The researchers demonstrated this by deleting genes linked to producing and absorbing oxytocin in the brains of zebrafish, a small tropical fish often used for research. Those fish were then essentially antisocial – they failed to detect or change their behavior when other fish were anxious. The study also showed that zebrafish will pay more attention to fish that have previously been stressed out – a behavior the researchers likened to consoling them.The new research illustrates"the ancestral role" of oxytocin in transmitting emotion, said Rui Oliveira, a behavioral biologist at Portugal's Gulbenkian Institute of Science and a study co-author.
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