Humans might be the only species to sniffle and giggle through a romantic comedy, but there's good reason to think many other animals also have some capacity to share emotions with their kindred.
To better understand the role the hormone could play in the transmission of fear in zebrafish, the researchers used mutant varieties that had broken versions of the chemical and two of its receptors.
Watching a distressed shoal from afar, fish with functional oxytocin hormones and receptors all froze as expected. Mutated versions of the zebrafish, however, swam on like silvery little psychopaths, barely caring one whit for their terrorized neighbors. Follow-up investigations on the fish using neuronal activity markers tracked responses deep inside their brain, finding parallels between the areas responsible for their reactions and those responsible forBased on these findings, it could be concluded that the biology of experiencing stress after witnessing fear responses in another is similar enough in all vertebrates to have evolved in a shared ancestor.
To see if this was what was happening, the researchers showed individual fish video clips of others in distress or neutral states before placing them together, along with some other fish, after a short amount of time had passed.
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