usually we can accurately feel which part of the body is affected by sensory stimuli such as touch, but in fact, the human body is also easily deceived in this respect, the illusion of the "third hand" is such an example.

the researchers conducted an experiment in which subjects placed their hands flat on the table, then placed a rubber prosthetic hand, and then used small brushes to touch the corresponding positions of the artificial hand and the real hand. While the subjects felt the contact of the small brush, they saw the appearance of the artificial hand being brushed.

next, it's time for the show, when researchers suddenly use hammers, knives and the like to make it look like they're going to smash rubber hands. As a result, subjects who knew their real hands would not be threatened would react as if their hands were injured, withdrawing their hands quickly and even jumping with fear. It is said that in such experiments, poking a fake hand and a real hand can produce about the same level of stress response.

in another experiment, the researchers successfully used virtual hands to show a similar phenomenon. They lied to the subjects that they were controlling the movement of a virtual hand through a brain-computer interface (probably bending their own hand and then the virtual hand would receive EEG signals to do the same). But in fact, the movement of the virtual hand is completely controlled by the researchers. In the middle of the experiment, a finger of the projected virtual hand was suddenly amputated. As a result, the subjects treated the virtual hand as their own hand, resulting in a strong reaction:

(feel slightly cute …... )

from this, it can be seen that visual signals have a very important impact on other sensory systems and human responses, and it will also bring a lot of confusion if there is a contradiction between visual signals and sensory signals.

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however, there is a side to this illusion that can be used, for example, in the study of prosthetics and to make people feel more real about virtual reality.

if you read the original text, you can see more optical illusions. However, there is a video in the article, so it is recommended to open it with a computer.

the most popular article last week was the one in Bobo Baby's meme (reply keyword: Bobao Bao), but I think everyone has read it. The second is the small experiment of the tea bag rocket. If you reply to the tea bag rocket, you can see

the most popular article last week was the one in Bobo Baby's meme (reply keyword: Bobao Bao), but I think everyone has read it. The second is the small experiment of the tea bag rocket. If you reply to the tea bag rocket, you can see