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Five ways in which the brain uses to lie to us

21 Jun

The BrainWe used to depend on our five basic senses, and quite forgot that they can sometimes lie: the different parts of the brain together form our perception of reality, but often it goes against common sense.

1. Your eyes can make you hear the words

When you hear someone say, all seemingly quite simple: the mouth of another person creates a sound that your ears hear. It seems that this scheme works well, what could possibly go wrong?

In fact, your eyes can deceive you: sight in most people is the dominant sense, which means that sometimes it is the eye determine what your ears hear.

For example, a person over and over again says something like boom-boom-boom, and then he suddenly changes the sound to AHF-AHF-AHF – at least according to my eyes. In fact, the sound is not changing, only: that is, the voice still says bang, but as the articulation has changed, you automatically start to hear a different sound, and if you close your eyes or look away, then sound again become a bang.

This illusion is called the Mc Gurk effect, and the most surprising thing is that even if you know which is pronounced in reality, your ears will still hear what prompted his eyes. Typically, the Mc Gurk effect is reduced to a minimum if you are dealing with a familiar person, but fully manifested in a conversation with a stranger. It matters even then what a person wears – you subconsciously expect from him certain words.

2. Your brain takes away some of the objects of your field of view when you’re driving

We have all seen optical illusions, but it is only a small part of how the brain can deceive our senses: it is able to ignore the light of a lantern at night in the rear view mirror when you are driving. For example, look at the blinking green dot in the center of the picture for ten seconds.

Have you paid attention to the yellow dots on a circle? No, because in a few seconds they disappear from view: you know what the point is still in place, but your brain refuses to see them. Similarly, the light fades lights and headlights when you focus attention on the road ahead. That’s why people who are guilty of road accidents often say: It appeared as if from nowhere!.

Scientists call this phenomenon ability discard information that at the moment he identifies as having no value. In a world of too much stimuli – the sounds, the smells, moving towards objects – and if the brain handles all incoming information, it would have received a significant overload. Instead, it filters out “useless” things: why it is so difficult to keep track of all the passers-by walking along the same street as you.

The problem is that the brain does not always correctly responds to the signals: in our example, the brain receives the blue line for something important, because they are on and ignore the yellow dots, because they stay in place.

3. Your eyes can affect the taste of food

If you have no deviations, called anesthesia, you hardly thinking about what color to taste, or vice verse – as a taste looks like. But in fact, these feelings are related: our eyes to determine how a particular food is necessary for us to taste, and it’s not just the fact that we no longer want to eat food that looks appetizing.

For example, the tasters considered that red wine better combine some products as white – other, moreover, each type of wine flavor revealed at a certain temperature. The scientists set out to find out what influences the perception of taste, and asked the members of a London wine clubs to describe the flavor of white wine. At first, people were talking about the aftertaste, traditionally identified as characteristic of white wine – bananas, passion fruit, red pepper, however, when the researchers added a red wine stain, experts have begun to talk about the aftertaste characteristic of red wine. Note that it was the same wine, only a different color.

This experiment was repeated several times in different clubs, and the result was always the same. Once one of the most prestigious wine tasters trying to describe the taste of white wine, colored red, and tried for a long time – but not because he has correctly identified the brand, but because he was trying to discern which of red berries, this wine is made.

Example of wine – not only: glass shade can affect the temperature of the drink and, for example, in one experiment, hot chocolate participants seemed tastier if they drank it from coffee cups or orange color, and flavor of strawberry jelly will appear more fully served if the dish on a white plate, rather than dark.

4. Your brain changes the size of the surrounding objects

The eyes often deceive us as to the size of the objects that we see: a look at the two red lines on the pictures and try to figure out which one is longer.

If you answered that the line on the right, then you are absolutely normal people, and yet you’re wrong. Line in the left brain is reduced for the same reason that the objects in the distance appear smaller than you – it in perspective.

To see such illusions in real life, just look at the night sky, when the moon was just rising over the horizon, it looks great, but for the next few hours, it gradually “reduced” and closer to midnight, it seems very small. This does not mean that the moon suddenly moved away from the Earth – it looks bigger because the objects in front of it – the trees and buildings – create the illusion of perspective.

And what is strange: how easily you succumb to the illusion depends on what you are used to seeing: for example, urban residents are more vulnerable to the deceptions of view. On the other hand, if you grew up far from civilization, in your brain will not be stored as memories of the large rectangular objects, so to deceive him by illusions will be more difficult.

5. You can easily forget where your limbs

If you put your hand next to a fake rubber hand and ask what kind of hand is actually yours, then you will definitely answer this question without hesitation, but is likely to go wrong. If your real hand than what is covered, and you see the brush, then simply at the same time to touch both hands to enter your brain is misleading: you do not see your real hand and automatically take a fake – visible – for his hand. If you hit an artificial arm with a hammer, you tremble, though not feel pain – the brain instinctively react to the strike.

Even more interesting is the fact that once your brain makes an artificial arm over your own, the temperature of this hand, hidden from your eyes, falls sharply, pointing to the restriction of blood flow at the time – in other words, your brain begins to deny the very existence of your real hands on a physiological level.

This phenomenon, also called preconception, shows that your eyes play a huge role in the awareness of their own body parts: it allows you to drive a car without looking at your feet, or blind typing on the keyboard. For the same reason teenagers seem awkward – they do not immediately have time to get used to what is grown, and their brains are often distorts the visual perception of its own body.

Preconception is often used for the treatment of phantom pain after amputation – enough to show the patient an artificial limb with a mirror, so that the brain has decided that the arm or leg is still in place.

 
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Posted by on June 21, 2013 in Human, miracles

 

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