Muller lyer illusion
Muller Lyer Illusion

Muller Lyer Illusion Definition and Application in Real Life

Take a look at the featured image above. Where’s the longer line?

The answer: same length.

Even though I’ve told you that the two lines above are the same length, your eyes still see that the line is different in length, right?

How hard you try. It still looks different in length. The longer is the top.

This is called the Muller Lyer illusion.

The only way you don’t fool muller-lyer illusions is, you have to learn to “not believe” in everything of you seen by your eyes. Not everything you see is true.

What is the lesson in our daily lives?

The illusion is a misinterpretation of existing stimuli, which causes the perception to not conform to reality, so that the existing stimulus is misinterpreted. Illusion is something that naturally occurs in perception. Physical or psychological distortions can cause an illusion to occur.

An illusion occurs when the brain senses a difference in the true quality of an object or stimulus. In reality the most common illusion in humans is a visual illusion or illusion associated with the sense of vision. One of them is the Muller Lyer Illusion.

Muller Lyer Illusion Definition

Muller Lyer illusion is an optical illusion that occurs when one misunderstands the length of one of two lines with a variety of arrows, where one line is bounded by an inward arrow and the other line is bounded by an arrow pointing outward, one between the two lines can be moved in and out. Observers who observe the line with the arrow, will experience an error in perceiving the length of the line.

Arrows with “inward angle” and “outward corner” functionally distinguish illusions that occur. In the Muller Lyer illusion, processes the human visual system judging that line with arrows are seen at depth and distance in daily life. Where the “inside angle” is configured accordingly at a closer distance, and the “outside angle” is configured according to the distance.

Matsumoto (2008:66) suggests that the muller-lyer illusion has two arrow lines at each end of the line. The line on the left has an arrow pointing out and the line on the right has an arrow pointing inward.

Matsumoto (2008:77) suggests that the muller-lyer illusion is an illusion due to the angle of the line that makes the line look longer and shorter depending on the direction of the arrow.

Shacter, Gilbert, and Wegner (2011:19) suggest that the muller-lyer illusion has two horizontal lines equal in length. Shacter, Gilbert, and Wegner (2011:19) suggest that the illusion of gestalt psychology is used to show the overall perception influences an individual assessment of an object.

Wade and Travis (2007:212) suggest that the brain defines a line with branches pointing out as further lines and in-line branches look closer. Wade and Travis (2007:212) suggests that the muller-lyer illusion is a line that describes the depth of individual perception.

Reber and Reber (2010:600) suggest that the muller-lyer illusion is the illusion of an arrow with a length between two exact lines. 

Quinlan and Dyson (2008:224) suggest that the muller-lyer illusion will still occur if the individual is not told that the two lines are the same length. Individuals will still see two lines of different lengths, although individuals attempt to equalize the length of the line.

Solso, Maclin, and Maclin (2008:78) suggest that the muller-lyer illusion is illusioned by two lines that appear to have different lengths, although both lines are the same length.

Muller Lyer Illusion in real life: Not everything you think is true, is true.

We have to practice not to really believe in what we see.

The same is the case with your own feelings. You have to learn to separate feelings and facts. It’s the only way not to get caught up in the illusion. In order for you to be more happy with what I’m saying, it’s a good idea to check out my explanation of our brains work below.

The human brain is divided into two working systems, according to Daniel Kahneman, a Nobel Prize in Physics from Israel. Fast thinking and slow thinking.

Muller lyer illusion in real life - human brain working system
Muller Lyer Illusion Definition And Application In Real Life 2

System 1, works quickly. If it’s a computer, it might be a fall in memory cache. To store that is repetitive, and almost unthinkable. Habits are stored here. Let’s say I wake up in the morning.

As for system 2, it works slower. More energy consuming. The computer works harder. Because it’s processing more. It is usually used when we count, compare, and other heavy work.

Well, because the original human innate is a lazy, then the first one used MUST be easy first rather than difficult. Then the first one accessed is system 1 (fast thinking). Straight to the easy one.

Well, this is a fast thinking system. Jump to conclusions. Sometimes it’s good. But.. It needs to be supported by us also enable system 2, not only system 1.

This is also what causes hoaxes to spread so quickly.

When a person gets a message that triggers his or her emotions, the quickest reaction is to activate system 1. That’s it. The disseminated facts look right, the signs look right. But… Is that really true? Right?

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Last Updated on February 12, 2021 Reviewed by Market Health Beauty Team


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