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Archerfish has the ability to recognize human faces: Study

In 2015, a study was done on Ambon damselfish (Pomacentrus amboinensis) where these fish could recognize facial differences among their own species with the aid of ultraviolet wavelengths

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Archerfish. Image source: awesomeocean.com
  • The Archerfish can be trained to recognize faces
  • Prior to this discovery, it was thought to be impossible
  • Scientists trained them with treats

Humans differ from other species in every sense of the term. Our physique, our body composition, and our mental capacity makes us stand out from the rest of the creatures on this earth. It is particularly our mental capacity, and our cognitive thinking that makes us to feel superior to other species and with this type of mental strength we are able to recognize when we discover new facts, and admit wrongs.

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A recent study published in the journal “Scientific Reports,” shows that we were wrong about fish, or at least one specific fish. The Archerfish, scientifically known as the Toxotes chatareus, which can actually be trained to recognize a human face.

Prior to this discovery, it was a universal fact that fish do not have a neocortex. The neocortex is a part of the brain in mammals. That is why this find is so interesting. When scientists look at the neocortex in mammals such as rats it is a smooth gray matter. When l we look at the neocortex in more advanced specifies such as humans and primates, it has grooves and these grooves increase the area of the neocortex. The responsibilities of the neocortex are as follows, sensory perception, motor commands, spatial reasoning, conscious thought, and language in humans.

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The Archerfish has the ability to recognize patterns. When thoroughly trained, the fish can differentiate between two photographs of people, and with astonishing accuracy. Scientists chose the Archerfish because it spits water, allowing scientists to understand what it was trying to communicate.

The scientists used operant conditioning to train the fish. They presented pictures of faces to the fish and taught them to distinguish between the two, and choose one over the other. When they chose the correct face, the fish were rewarded with fish feed. This process was repeated for days and up to two weeks.

The accuracy of the fish shocked scientists. The fish were correct 81% of the time. The stunned scientists further when their accuracy increased to 86% when the pictures were changed a bit in regards to color tones and head shapes. The fish simply look for patterns among the faces.

Other studies like this one have been conducted in the past. In 2015, a study was done on Ambon damselfish (Pomacentrus amboinensis). This research found that these fish could recognize facial differences among their own species with the aid of ultraviolet wavelengths. It is thought that they use this facial recognition tool to communicate with each other silently, keeping predators in the dark.

-by Abigail Andrea, an intern at NewsGram. Twitter: @abby_kono

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Mexico Mammoths: Human-Built Woolly Mammoth Traps Found in Tultepec

Researchers speculated that ancient hunters probably chased the giant animals into the pits, which are 1.70 meters deep and 25 meters in diameter

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Mexico, Mammoths, Human
In this undated photo released by Mexico's National Institute of Anthropology and History, mammoth bones lie at an excavation site in Tultepec, just north of Mexico City. VOA

Anthropologists have found skeletons of at least 14 woolly mammoths that died after falling into traps built by humans 15,000 years ago.

The two pits were found in Tultepec, just north of Mexico City, Mexico’s National Institute of Anthropology and History said this week.

Researchers speculated that ancient hunters probably chased the giant animals into the pits, which are 1.70 meters deep and 25 meters in diameter (5½ feet by 82 feet).

There was some evidence that some of the mammals had been butchered.

Mexico, Mammoths, Human
The two pits were found in Tultepec, just north of Mexico City, Mexico’s National Institute of Anthropology and History said this week. Pixabay

Luis Cordoba, the head of the excavation team, said the discovery was key in studying the relationship between prehistoric hunting and gathering communities and the huge herbivores.

“There was little evidence before that hunters attacked mammoths. It was thought they frightened them into getting stuck in swamps and then waited for them to die,” he told reporters. “This is evidence of direct attacks on mammoths. In Tultepec we can see there was the intention to hunt and make use of the mammoths.”

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The pits were found when crews were digging in the area to build a garbage dump.  (VOA)