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Cats and Dogs Have All 6 `Indra`! Seeing the Invisible
Cats and Dogs Have All 6 `Indra`! Seeing the Invisible
Liputan6.com,
London: Barking dogs with unusual sound in the middle of the night, a
cat who suddenly restless - have long suspected that used to be a pet
animal that humans have a sixth sense. Seeing the invisible appearance. Is this true?
Now, scientists may have a scientific explanation for the strange behavior. At least they can see what the human eye can not be captured.
Unlike us, many animals can see ultraviolet light (UV) - including dogs, cats, and a number of mammals.
"No
one ever thought that these animals can see ultraviolet. Fact, they
do," said Ron Douglas, leader of the study and a biologist from the City
University, London, England, as quoted from the site Liputan6.com
LiveScience, Thursday (20/2 / 2014).
The light consists of a spectrum of colors. The
visible spectrum (visible spectrum), which can be seen by human eyes,
extending from red to purple - with a wavelength of 400 to 700
nanometers, over UV wavelengths.
Many
animals can see ultraviolet including insects (eg bees), birds, fish,
some amphibians, reptiles, and some mammals (mice, rats, moles,
marsupials, and bats)
Blockade
of the human eye lens ultraviolet light, but in animals with the lens
'transparent', ultraviolet light can reach the retina them - which
convert light into nerve signals that travel to the brain where the
visual system to accept it.
Even in the animal's eyes are not too sensitive to UV, some exposure to ultraviolet light can still escape and be absorbed. In
fact, a number of human eye lens is removed, as in cataract surgery,
and then not replaced with a lens that can block ultraviolet - they can
see UV.
In
a small study, a team of scientists examined a number of mammalian eye -
from hedgehogs, red pandas, until macaque monkeys - were dead, shot
donated from zoos, veterinarians, slaughterhouse, and laboratory
science. Scientists can measure how much light through the lens of each animal to the retina.
The
team found that a number of animals including hedgehogs, dogs, cats,
ferrets and okapis - giraffe relatives who live in the rainforests of
central Africa - has a lens that allows ultraviolet light to pass
through. Shows these animals can see ultraviolet light.
So, what's the point of the ability to see ultraviolet?
"The question as it was posed because humans can not see it," said Douglas. However, no one asks, why humans are able to see the other colors.
Some animals use the ability see ultraviolet for a number of purposes. Bees
and other insects also use it to see the color or pattern in plants
that can direct them to the location of nectar or pollen. Rats
use it to keep track of the urine, while deer can use ultraviolet light
to see the polar bears - are in the midst of light, white color mixed
with snow.
Why UV Blocking Human Eye?
More precise question asked is, why people do not translucent UV light. One possibility, says Douglas, is that ultraviolet light can damage the retina - as it can damage the skin.
Surprisingly, a number of animals active during the day such as deer can see ultraviolet light. "But their eyes are not damaged," said Douglas,
Alternatively, the human eye to ultraviolet light filter to improve visual acuity. Humans
have a good ability to see the detail - because we have a lot of
sensitive or cone cells in the retina, which produces high-quality
images with only a small amount of light. Meanwhile,
the nocturnal animals have eyes that let light enter as much as
possible, including ultraviolet light, but do not know exactly what the
goal is.
The
researchers said, by knowing the number of animals has ultraviolet
vision, providing a deeper understanding of why they behave strangely. Or, perhaps, there is something wrong in your pet cats and dogs ... (Ein / Yus
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