Can somebody explain how and why Deja Vu happens?
That's hard to say. I went through periods like that and it drove me completely bonkers because I didn't know what they were at the time, and no one could explain them to me. Some a-holes advised me to get right with jesus and they'd probably go away. Other a-holes told me I was being reminded of stuff from a past life. Eventually I ran across mention of them in connection with seizures. More research into this and I finally found studies that had proven they were seizure activity in the limbic system.Blahness said:If you consistently have dejavu(like many times a day), is that cause for worry?
You missed the point about simple-partial seizures: there is no loss of consciousness during a simple partial, and the person has total recall of what he experienced. Go to the link I posted above. There are a few quotes from people describing what they go through during their simple partials.Fractal Freak said:...but individuals with seizures do not have any recollection of what occurred.
This is just pure speculation on my part, but one possible explanation is that your conscious experience of the conversation was lagging behind the actual conversation for some reason. So you had the information coming into you about who just said what, and this registered on some subconscious level, but your actual conscious experience occurred slightly later. I'm not aware of any other cases of temporal distortion of consciousness like that though. A simpler and less exotic explanation would be that you didn't really know exactly what was about to be said, you just had a strong feeling that you did.Fractal Freak said:Any ideas to help with this paradox would be helpful. :uhh:
When I have a lot of deja vus in clusters I inevitably start feeling like I "know" exactly what is coming next. This had to happen to me many times before I realized that what was actually happening is that the feeling of familiarity was becoming attached to the normal train of speculation we all engage in about what is going to happen next, or what someone will say next.hypnagogue said:A simpler and less exotic explanation would be that you didn't really know exactly what was about to be said, you just had a strong feeling that you did.
That mention is simply made in conjunction with occipital lesions. In other words they're simply correlating lesions at a certain location with specific sorts of symptoms. They don't always have a good idea of the exact mechanism: why that lesion leads to that particular distortion. "Palinopsia" seems to be applied to any experience where there is some form of visual repetition, and I've read of several different things that fall under this heading. I'm really only offering it as an informed suggestion about your experience.Fractal Freak said:Wow, that sounds like an interesting topic. Were they ever able to distinguish a mechanism of action for this palinopsia.
Yes, your experience sounds to me like it involved the temporal, parietal, and occipital lobes all at once. I would say this must have been the right hemisphere, because if it had been the left hemisphere you would probably have suffered a language deficit of some kind.Sounds more like occipital activity, but you're right about the ability of the seizure to spread, so I'm not sure.
I was very struck and impressed with Oliver Sacks' book The Man Who Mistook His Wife For A Hat. This lead to reading many of his other books, then similar books by Harold Klawans (another neurologist), then I happened on a book about synesthesia by Richard Cytowic, which mentioned that the deja vu was a common simple partial. Since I had had so many of these crazy-making deja vus, this info lead to a study of seizures in general, and especially the interesting book Seized by Eve LaPlante. I used to go to the medical library of the local university quite a bit and look articles up in the back issues of neurology journals and since I got on the web I've been able to read first hand reports of all kinds of seizures by people posting on epilepsy websites.Definitely a possibility though. How are you so familiar with all of this?
If what you say is true, then you're not having deja vu's, you're having some sort of authentic precognitive experience.seraphim said:How could a seizure in my brain cause this exact fortelling of a period of several minutes?
Most people I've explained this to balk at the word seizure because it's the first time they've ever encountered the notion that a seizure can be very tiny and not really much of a problem. It takes a while to get used to that.seraphim said:Well, I suppose that the idea seems to make more sense... though I'm quite skeptical about precognition. But then again, I suppose that I'm no more skeptical about that than I initially was about seizures in the brain.
To add another of my 2¢ on how weird my mind is:zoobyshoe said:The deja vu is an incredibly weird sensaton that the present situation you are in is unbelievably familiar, as though you are remembering it from the past even though there's no way it could already have happened.
Neurologists have proven that it is caused by a tiny bit of seizure activity in the neurons of a part of the brain called the hippocampus. Even though this is technically seizure activity it's nothing to get worried about: all that means is that the neurons are firing all at the same time for no good reason.
The hippocampus is a major contributor to memory, and performs some vital function in the storage and retrieval of memories. When it gets a power surge like this it creates the false impression that the present is a memory, when it isn't.
A small seizure like this is called a simple partial seizure. This means it is confined to one small location in the brain, and that there is no loss of consciousness.
Most people have at least one deja vu in their lifetimes, some have many more than that. The hippocampus is part of the limbic system of the brain, which is the very touchiest part, the most likely to experience seizures.
What is interesting to me is that there is an opposite to the deja vu called the jamais vu. When a person has this kind of simple partial things around them seem weirdly unfamiliar. They fail to evoke the proper feelings of recognition despite an intellectual realization that you should recognize them. They feel all strange and wrong.
Here is a site that describes some of the many other weird symptoms that simple partial seizures can cause:
Simple Partial Seizures
Small stacks of things? Like what? That's a very specific and unusual trigger. Mine are not connectable to a specific trigger.Mk said:There is an odd correlation between looking between small stacks of things, and deja vu.
I meant small stacks of books and poker chips particularly. After sleeping on it, I conclude this:zoobyshoe said:Small stacks of things? Like what? That's a very specific and unusual trigger. Mine are not connectable to a specific trigger.
I've never had a jamais vu myself, although back in college I remember staring at my face in the mirror when I was drunk and feeling the image I saw couldn't possibly be me.
No, its not. My comment was directed towards your account of waking up and walking around and going back to bed, but waking up from that dream.zoobyshoe said:That's a good name for it. I don't suppose it's the same thing as getting "stuck" in REM sleep, which would have a result more like sleepwalking in a genuine instance of it.
I know exactly what you are talking about.matthyaouw said:My deja vus are incredibly annoying. In most of them I feel like I'm having a deja vu of a deja vu.
I don't quite understand how that works, but it's very frustrating.
Anywhere from a split second to indefinitely. In my case the deja vu is very brief. It comes on very strongly all of a sudden, then fades, rather like the dynamic of the sound of a large bell being struck.matthyaouw said:[How long do partial seizures last for?
You are aware of it as soon as it happens. There's no delay. That " feeling" is the seizure activity. If it were located in your motor strip instead, for example, the convulsing limb would be an instantaneous manifestation of the misfiring neurons.I'm thinking if a seizure were still going on by the time I become conciously aware of the deja vu,
Actually, I just realized I could take a pic of the EEG of a deja vu and post it:matthyaouw said:I see. Thanks! :)
Could this be linked to how one eats? Or the architecture of one's brain. Are all of our brains' architecture the same?zoobyshoe said:The hippocampus is a major contributor to memory, and performs some vital function in the storage and retrieval of memories. When it gets a power surge like this it creates the false impression that the present is a memory, when it isn't.
It's not a normal function. It means something is off, not working properly. Could be chemical, from diet, stress, lack of sleep, etc, or could be from hippocampal sclerosis, or other damage.Mk said:Could this be linked to how one eats? Or the architecture of one's brain. Are all of our brains' architecture the same?