Déjà Vu - ScienceNerds

The feeling living in nature during a circumstance that you simply are right now in however never been before...

for example, you're just sitting with a group of friends and discussing a topic and without warning, you'll get a feeling that u experienced that very particular moment before and you can't exactly pinpoint when and where.

Some people claiming that they do even know the future of that situation for an instance for example what would be the next sentence from your friend, the instance before he speaks it out.

this feeling is widely experienced by people around the globe and is familiar with the name Déjà Vu. 

déjà vu means "already seen".

This phenomenon is seen quite commonly in adults and in their age, but this is not seen at all until the age of 8 to 9 years and completely fades out after 40.

science has many explanations for why it occurs in the first place.

It can be explained as the cause of pattern matching activity by the subconscious mind.

when you are lying on the bed chatting with your friend on phone and suddenly your mobile device falls down, but the second before it happens you will be getting a feeling of your mobile slipping off your hand, that's where we feel Deja Vu. But it's simply the aftereffect of your psyche attempting to discover designs in your exercises, right around a day you visit together with your companion lying on bed its a  really common thing hence you don't focus on it consciously but your mind keeps track of such every activity which make a repeated-pattern every day, your actions of chatting on mobile, lying on bed and mobile slipping off your hand makes a sequence which your mind is in search of, so next time when you lay on the bed while chatting on mobile your mind alerts you that the next action could be your mobile slipping off your hand, and if it is processed by your conscious mind and your grasp is fixed the following occasion may not happen.

But why the brain carries pattern matching activities?.

well, the Evolution theory has the best answer, at the time homo sapience were in the jungles and had a fear of life for survival from wild animals and other tribes the brain evolved itself some functionalities to make its body survive in dangerous situations by predicting the upcoming danger.to predict upcoming dangers and to plan a defence strategy accordingly it uses to match the sequence of events occurring and hence with the time this activity became subconscious as it became a survival necessity. 

presque vu: Tip of Tongue

Tip of the tongue is the phenomenon of failing to retrieve a word or term from memory, you feel like the word is on tip of the tongue but you can only retrieve it partially. people having that feeling usually say the word is at the tip of my tongue hence the name.

People experiencing the tip-of-the-tongue often recall some features of the target word, just like the first letter of the word and similar phonetic words or meaning. People report a feeling of being seized by the state, feeling something like mellow anguish while looking at the word, and a method for help when the word is found.

This situation of memory occurs thanks to our unique brain functionality.

Whenever single attempts to retrieve the word the brain blocks the just like-sounding words providing us with the desired word, in this task the target word gets blocked by the brain sometimes which leads to TOT.

Tip Of Tongue features a shared or social aspect, i.e during a group if one person is feeling this state and unable to retrieve the target word the others in the group are probably going to feel presque vu, and on changing the conversation subject all of suddenly one person retrieve that attention on the word

jamais vu: French word confusion(jamais vu) meaning Never seen, is that the situation a private is during which is extremely familiar but at the purpose of your time it seems very unfamiliar or explicitly new or meaningless.

It is often compared with short term amnesia, but science gives an explanation saying that it is often induced experimentally within the laboratory. When an individual is asked to write or say aloud a word several times he/she starts losing the meaning for that word, it is explained as on receiving the repeated information several times in the short amount of time our neurons no more fire the connections making the word meaningless to our brain.

~sciencefreak