Discuss: What causes Deja vu?

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Offline thedoc

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Discuss: What causes Deja vu?
« on: 05/07/2013 23:34:16 »
What is freezing rain, do cats control their owners, how do accents arise, why does hair go grey, what is the origin of deja vu, why did my glass table spontaneously explode and is the world population becoming more or less genetically diverse? Dr Chris tackles this week's round up of the best science questions from South Africa...
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« Last Edit: 05/07/2013 23:34:16 by _system »

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Offline Geezer

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Re: Discuss: What causes Deja vu?
« Reply #1 on: 10/02/2012 21:00:04 »
Didn't we discuss this already?
There ain'ta no sanity clause, and there ain'ta no centrifugal force ćther.

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Offline neilep

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Re: Discuss: What causes Deja vu?
« Reply #2 on: 11/02/2012 10:10:50 »
Didn't we discuss this already?

Didn't you ask that already ?
Men are the same as women, just inside out !

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Offline Geezer

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Re: Discuss: What causes Deja vu?
« Reply #3 on: 11/02/2012 21:40:41 »
Didn't we discuss this already?

Didn't you ask that already ?

I have a feeling I might have.
There ain'ta no sanity clause, and there ain'ta no centrifugal force ćther.

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Offline Don_1

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Re: Discuss: What causes Deja vu?
« Reply #4 on: 13/02/2012 10:05:42 »
Didn't we discuss this already?

Didn't you ask that already ?

I have a feeling I might have.

Well I don't remember anything of the sort. Did I forget this before?
If brains were made of dynamite, I wouldn't have enough to blow my nose.

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Offline Geezer

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Re: Discuss: What causes Deja vu?
« Reply #5 on: 13/02/2012 17:59:46 »
Didn't we discuss this already?

Didn't you ask that already ?

I have a feeling I might have.

Well I don't remember anything of the sort. Did I forget this before?

Didn't we discuss this already?
There ain'ta no sanity clause, and there ain'ta no centrifugal force ćther.

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Offline neilep

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Re: Discuss: What causes Deja vu?
« Reply #6 on: 13/02/2012 20:13:06 »
Didn't we discuss this already?

Didn't you ask that already ?

I have a feeling I might have.

Well I don't remember anything of the sort. Did I forget this before?

Didn't we discuss this already?

Didn't you ask that already ?
Men are the same as women, just inside out !

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Offline Sprool

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Re: Discuss: What causes Deja vu?
« Reply #7 on: 14/02/2012 12:41:09 »
I knew this thread was going to go this way............. ;D

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Offline Don_1

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Re: Discuss: What causes Deja vu?
« Reply #8 on: 18/02/2012 17:18:00 »
I knew this thread was going to go this way............. ;D

Strewth! Must be Deja Vu.
If brains were made of dynamite, I wouldn't have enough to blow my nose.

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Offline Nizzle

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Re: Discuss: What causes Deja vu?
« Reply #9 on: 21/02/2012 11:45:19 »
I knew this thread was going to go this way............. ;D

Strewth! Must be Deja Vu.

Didn't you...?

Ah nevermind.
Roses are red,
Violets are blue.
Most poems rhyme,
but this one doesn't

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Offline Sprool

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Re: Discuss: What causes Deja vu?
« Reply #10 on: 21/02/2012 12:13:07 »
In his marvellous book "The man who mistook his wife for a hat", Oliver Sachs hinted at a process which could explain deja vu, which consisted of a small delay in the brain processing memory and interpreting events, thus the eye could picture a scene and the brain register it in the memory banks, then a moment afterwards the interpretation of the scene could take place whereby the 'live' image was compared to the initial one already preserved in the short term memory only 1/10 of a second beforehand. The brain would thus see the live scene as the same as the memory and you would get a feeling you had 'been there before'.

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Offline Geezer

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Re: Discuss: What causes Deja vu?
« Reply #11 on: 21/02/2012 20:04:47 »
Slightly related is the "onosecond".

An onosecond is the time it takes for your brain to realize that it is now inevitable that you will depress the Enter key, even though your brain is trying to prevent you from depressing the Enter key.
There ain'ta no sanity clause, and there ain'ta no centrifugal force ćther.

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Offline imatfaal

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Re: Discuss: What causes Deja vu?
« Reply #12 on: 22/02/2012 10:13:25 »
Slightly related is the "onosecond".

An onosecond is the time it takes for your brain to realize that it is now inevitable that you will depress the Enter key, even though your brain is trying to prevent you from depressing the Enter key.

There is research on that dreadful feeling - I will try and find it.  It seems that our concept of an ordered flow of events is maybe a bit more of a mind construct than simple thought and perception.  Deja vu and the onosecond are events that emphasis the slight failings of the system - and they can use FMRI (I think) to tease apart the actual order things are happening in our head rather than the internal representation of how they are happening. 
There’s no sense in being precise when you don’t even know what you’re talking about.  John Von Neumann

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