The Blind Spot: Does Our Brain See Things that Aren't Really There?

Can We Trust Our Memory? Believe it or Not, Our Brain Consistently Tricks Us

By Scott Schlimmer, published Mar 30, 2007
Published Content: 94  Total Views: 133,211  Favorited By: 19 CPs
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How Well Do We Remember The Past?

Generally, we think we have a good sense of the past. We may not remember everything, but the things we do remember, we're pretty sure of. Well I say that most of your memories are not accurate, but that's not what this article is about. I'm going to take this further.

How Well Do We Remember The Present?

This will sound silly at first, but I contend that not only do you have a flawed remembrance of the past, you also don't even remember the present perfectly. Sound absurd?

Blind Spot

Well let me introduce you to the blind spot. There is actually a blind spot on your eye that does not see anything. An optic nerve gets in the way, effectively blocking your vision. Our eyes can't see anything in this blind spot, but our brain makes up what should be there. This is why we don't notice the blind spot. Sound crazy? Click here to try it for yourself before continuing with the article.

What Does This Mean?

Amazing, eh? Now you've now seen first-hand that you can't even believe everything you see. Your brain literally makes things up. Our senses are imperfect, and our brain is just like an artist trying to understand what the senses tell the brain. Whatever our brain tells us, we believe. But even in the present, it isn't always right.

Definitiveness & Memory

Seeing is the human standard. People often say, "I'll believe it when I see it with my own two eyes." Once you've seen it, it becomes truth. But we often hear of cases where different people see things differently. We put too much definitiveness on the things we see.

I say don't be definitive, whether discussing things past or present. As you see, we can't even be sure what we're seeing is real. If our brain can trick us when we know it's going to trick us (if you don't believe that, try the Blind Spot Test again), think about how much the brain tricks us when we don't know it's going to trick us.

Imagine how many times you've really wanted to see something. Do you think your mind could have tricked you any of those times? Perhaps you "saw" what you wanted to see.

The Blind Spot:  Does Our Brain See Things that Aren't Really There?

There is actually a blind spot on your eye that does not see anything. Our eyes can't see anything in this blind spot, so our brain makes up what should be there.

Credit: Chris Davis

Copyright: Chris Davis

Takeaways
  • The human standard is to believe something once we've seen it.
  • Our brain is like an artist trying to understand what the senses tell the brain.
  • When information is missing, the brain essentially makes stuff up to fill the missing details.
Did You Know?
There is actually a blind spot on your eye that does not see anything. An optic nerve gets in the way, effectively blocking your vision. Our eyes can't see anything in this blind spot, but our brain makes up what should be there.
Comments
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Yeah no name

Posted on 04/25/2008 at 6:04:35 PM

 
stupid

Posted on 04/25/2008 at 6:04:31 PM

 
ACSubmit, I think you missed the point. No one has said the blind spot is "new". Unless you consider human eyesight new. Besides, if you pick up a 1940's classic movie at the video store, it's new to you if you haven't seen it before. Just don't try to watch the movie in your blind spot. I like the blindspottest.com page better.

Posted on 12/06/2007 at 12:12:00 PM

 
Not really anything new. Its been on the net for a while: http://www.findyourblindspot.com/

Posted on 09/25/2007 at 5:09:00 PM

 
This is a good example of why "the map is not the territory" - meaning, we interract with our map and perception of the world, and not the world itself. So, assumptions are necessary (we couldn't get by in the world without constantly making assumptions), but it's also useful to not be afraid of questioning our assumptions and beliefs.

Posted on 05/27/2007 at 12:05:00 PM

 
ElizabethG: What you say is very close. The brain doesn't already "know" something is there, it ASSUMES something is there. It must make these assumptions because the image entering the eye is extremely imperfect to begin with so the brain must compensate for this and make educated guesses based on both past experience and the current information it's dealing with. These assumptions are right most of the time, but there are always counter-examples. This is why we often see things 'out of the corner of our eye' that turn out to be something else.

Posted on 05/27/2007 at 12:05:00 PM

 
To everyone who never saw the star dissapear: you're not doing it right. It wasn't 'working' for me at first either. The instructions are simple but follow them more carefully than I did the first couple times :-)

Posted on 05/27/2007 at 12:05:00 PM

 
This was really interesting. Although, for me-- that star never disappeared. Hmmm. But I can see what you are saying. It makes sense from a conservation perspective because the brain already knows something is there, so the eye doesn't need to "work" to process it.

Posted on 05/16/2007 at 1:05:00 PM

 
Interesting -- I never heard about this before!

Posted on 04/06/2007 at 10:04:00 AM

 
David & Muriel: I'm glad you saw it. Isn't it amazing how the brain just makes up what it thinks should be there?

Posted on 04/02/2007 at 6:04:00 PM

 
Alright, it worked!

Posted on 04/02/2007 at 5:04:00 PM

 
I tried it and it worked. I told my brother to try he did but it didn't work for him. I told him to try again but he didn't. Its cool how the blind spot works. http://images.associatedcontent.com/150_0000023837_0000069720.gif http://images.associatedcontent.com/150_0000023837_0000069720.gif

Posted on 04/02/2007 at 12:04:00 PM

 
Yes, try again. The dot must not have gone into your blind spot. Once it's in the blind spot, it's physically impossible to see the dot. I just tried it again. It works.

Posted on 04/02/2007 at 12:04:00 AM

 
I took the test but I say the star or dot at all times:) even when the background changed colors and patterns I could see the dot and star. did I do something wrong? Should I do it again?

Posted on 04/01/2007 at 11:04:00 PM

 
Glad you liked it! I was pretty shocked the first time I tried it.

Posted on 04/01/2007 at 2:04:00 AM

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