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  • Whether it’s Pixar’s Dory with short-term memory loss, or the sayinghe has the brain

  • of a goldfish” - were constantly told that fish are simple and have poor memories.

  • But are they more complex than we think?

  • This is the Rotating Snake Illusion - as you move your eyes, the snakes appear to be moving

  • in circles, but the image is actually stationary. It turns out that fish see this illusion in

  • a similar way to you and I. Even though fish diverged from land vertebrates 450 million

  • years ago, both have developed similar vision to hunt, escape predators, and avoid collisions.

  • Researchers have hypothesized that we see the same motion illusions as a result ofconvergent

  • evolution’, where organisms not closely related independently evolve similar traits

  • as a result of having to adapt to similar environments.

  • Which of these red circles is larger? Your eyes are likely telling you the one on the

  • right, and a fish would think so too. But it turns out they are the same size. In a

  • study on redtail split fins, the fish were trained to discriminate between disks of different

  • sizes and to prefer larger disks. And when presented with a similar illusion they chose

  • the deceptively larger one.

  • What about attention span? One particular report found that the human attention span

  • is down from 12 seconds in the year 2000, to 8 seconds today. Our use of the internet

  • and devices is theorized to play a role but, either way, goldfish have a 9 second attention

  • span, trumping that of a human.

  • When it comes to forgetfulness, a study using African Cichlids gave fish a food reward in

  • a particular zone of an aquarium for 3 days in a row. Then, the fish were given a 12 day

  • restperiod before being reintroduced into the aquarium. Using motion-tracking software,

  • the cichlids showed a distinct preference to the area of the aquarium where they had

  • previously received a reward. Studies have even shown goldfish can remember things for

  • at least 3 months; distinguishing between shapes, colours, sounds, and even navigating

  • mazes. On top of this, goldfish can recognize their owners. Ultimately, fish have been shown

  • to have quite good memories - after all they need to remember prey types, avoid predators

  • and even avoid our hooks after being caught in the past.

  • But when it comes to pain were actually quite different than fish. When you injure

  • yourself, receptors in your body callednociceptorssend signals to the neocortex where the sensation

  • of pain is processed. But many fish lack nociceptors and all fish lack a neocortex, so pain isn’t

  • experienced in the same way.

  • When Finding Nemo was first released, hundreds of fish were flushed to set themfree’,

  • while in reality these fish often die from trauma or exposure to fresh water. Additionally,

  • researchers worry that Finding Dory’s release could increase the decline in ornamental fish

  • populations as more people will want the Royal Blue Tang as a pet.

  • So we decided to make a video on 8 other Amazing Aquatic Animals on AsapTHOUGHT, where we visited

  • an aquarium to check them out in person. Our lakes and oceans are full of some wild and

  • beautiful creatures, so be sure to check it out with the link below!

  • And Subscribe for more weekly science videos!

Whether it’s Pixar’s Dory with short-term memory loss, or the sayinghe has the brain

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B1 US fish goldfish aquarium attention span similar illusion

Are You More Forgetful Than A Fish?

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    Ververia Li posted on 2016/07/18
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