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Your pressure, dog really understands!
, however, does not necessarily rely on telepathy, but may also be purely based on smell .
Recently, scholars from Queen's University of Belfast found that dogs can smell the odors produced under human stress.
They found more than 50 volunteers and 4 dogs to test it and found that dogs could completely identify the odor of ordinary human situations VS when the pressure was high, with an average accuracy rate of 93.75%. The result of
immediately attracted many netizens' attention, and the shit picker said: I'm very happy to have scientifically proved this!
Whether through smell or telepathy, my dog can always feel my anxiety and unhappiness, and then run over to comfort me.
This study was listed in the journal PLOS ONE, a subsidiary of the Public Library of Science. corresponding author of of
paper said that the study also provides a scientific basis for the training of new skills for service and treatment of assisted dogs.
You have to look at the mathematics of
. This research requires only three steps:
. The first step is to collect the odors produced by people under pressure;
. The second step is to let dogs know what the "smell of people under pressure" is;
. The third step is to test whether dogs can distinguish the odors of people when they are stressed and are not stressed.
first look at the first step. In order to accurately get the odor generated by people's pressure, the research team thought of is to let volunteers do math problems .
test requires volunteers to do subtraction from 9000, subtract 17 each time, and report each answer loudly. The calculation process of
does not have paper and pen, it can only be mentally arithmetic, and researchers will put pressure on volunteers.
For example, in a stern tone, he kept saying "Hurry up" and "it must be calculated to the end". If the volunteer answered correctly, he would have no positive feedback. If the answer was wrong, he would be interrupted and told them the correct answer.
No matter when the volunteers can persist, the entire test will last for 3 minutes. After the
test is completed, a piece of gauze will be used to wipe the back of the volunteer's neck, and then put it in a small bottle. The volunteer will breathe three times into the bottle, which means that a sample has been collected.
Before conducting the test, the subject will first give himself a score (0-10) of the pressure at that time, and then give another score when the test is finished. When the scores are subtracted by more than 2 points, it is considered that a valid sample has been collected.
has 36 valid samples. After collecting the experimental samples of
people, the dog came on stage.
Previous studies have shown that humans expel more sweat under pressure and release more volatile organic compounds (VOC). For example, the research results of Shiseido show that when people are under high pressure, they release dimethyl trisulfide and allyl thiol (produce a taste similar to onion and garlic).
This experiment will see whether the dog can distinguish these differences.
researchers found 4 dogs, including 2 caka and 2 bull terrier, with an average age of over 2 years old.
Through a specially designed device, the small bottle containing the smell is placed on the port for the dog to smell. When it chooses the right bottle, it will be rewarded.
At the beginning, 2 of the 3 options given by a set of experiments have no smell and 1 is the smell generated by human pressure.
When the dog tests 10 times, he can choose the correct answer after more than 8 times, which means that it has learned to smell this smell.
On this basis, interferers are added to the experiment, that is, the odor generated when people are not stressed, and then the dog is asked to find the odor when they are stressed.
experimental settings, every 20 tests are recorded as one round, and the dog can choose 16 times in both tests before continuing the experiment. According to the results of
, the 4 dogs completed a total of 36 rounds of tests, and the highest one can achieve 96.88%, with an average accuracy rate of 93.75%.
At the same time, the experiment also replaced the device several times to test to ensure that the dogs did not get the answers correct by other scents.
Wangwang team has been making contributions
In addition to being able to smell people's "Alexander", dogs actually know how to look at their faces.
Previously published in Contemporary Biology, a study showed that dogs can distinguish people's expressions when they are angry and happy. He can also accurately judge
or even the face of a stranger.
In addition, Japanese scholars have also found that the risk of disability among elderly people who keep dogs is about half of those who have never raised dogs.
(the table uses "1" as the benchmark, and the odds ratio (OR value) is less than 1 means the risk is lower)
At that time, this study also cueed that if you raise a cat, it would not have this effect.
In fact, this time netizens also discussed whether cats can accurately judge people's mood.
Someone said: It can definitely .
If you are not in a bad mood, it will do something to make you feel bad.
Reference link:
[1]https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0274143
[2]https://www.reddit.com/search/?q=Dogs%20can%20discriminate%20between%20human%20baseline%20and%20psychological%20stress%20condition%20odours
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