
© Cait Newport When trying to nab a flying insect (or point to a human face), archerfish spit jets of water.
A wee-brained tropical fish can distinguish between human faces in a lineup, researchers have found. This is the first time such an ability has been shown in fish.Recognizing human faces is a difficult task. Because nearly all human faces have the same basic attributes, recognizing a face requires distinguishing subtle differences in facial features, said Cait Newport, a zoologist and Marie Curie research fellow at the University of Oxford.
In fact, past research has shown that a select few animals — including horses, cows, dogs and
even some birds, such as pigeons — can successfully complete such a task. All of those animals, however, have a neocortex, or neocortex-like structures. The neocortex is a part of the brain that contains a visual-processing region as well as
the fusiform gyrus, which is thought to be heavily involved in facial processing, the researchers noted.
"Most animals tested possess a neocortex and have been domesticated, and may, as a result, have experienced evolutionary pressure to recognize their human [caregivers]," Newport and her colleagues wrote in today's (June 7) issue of the journal
Scientific Reports.
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