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"deja vu"

The sensation of deja vu happens when a person has a familiar feeling in some situation that is actually unfamiliar in its essence.  It is as if you have already experienced something that is a novel, like a person, a new place or event. Even if you have no recollection about to bring it back and finally understand why you had this awkward feeling of familiarity. 

Although this kind of cognitive experience appears challenging, at first sight, I believe that chapter 7 offers a good material to make a reasonable hypothesis about this subject.  Firstly, it is critical to acknowledge that our memory is subdivided into two different types that have their different ramifications each.  The primary types are explicit and implicit memory.  While the explicit memory is that one which is accessed to make conscious and intentional recalls, like remember a password, the implicit memory is that one which we have without awareness, because it is unconscious. Reflecting a habit that you can reproduce instinctively like brushing your teeth,  the implicit memory keeps people in their continuous performance in everyday life without any mental effort to such actions.

I believe that the roots of deja vu are directly related to the implicit memories that we have. In my opinion, this overwhelming sensation happens due to any lack of straightness in the pathways that we form processing the stimulus that we receive. All the time since our birth,  we are hit by many new stimuli at the same time that keep us assimilating, perceiving and learning all sort of things constantly.  All those pieces of information lead us to form memory connections, which encode ideas and impressions that interfering in how we remember of the past until the moment that we are now. However, not always, we can process all the information in the same way, making the right linkages that allows us to recognize and identify an episode correctly. The implicit memory needs that something is primed, to make it ready for the second exposure, forming connections that make the pathways that we have flows after being activated by the stimulus that we receive. The pathways are formed by the connections that tend to grow stronger as more as we use them. 

My theory is that the sensation of deja vu is caused by our exposure to a stimulus that we could not process completely for the first time, causing a failure to produce stronger connections that can be translated in the stranger familiarity that we feel toward a novelty.  In fact, we already had any previous contact related to this new episode but, at the exact moment, we were processing something else. To be more simple, we could not complete all process of creating the full acquisition of this implicit memory when we encountered the stimulus before, because maybe you were paying attention or distracted by something that demands more focus at the time,  preserving at least a brief and superficial register of the situation in your implicit memory. So, the next time that you face the same information that you could not totally process, you can perceive a familiarity with the situation, a deja vu,  even being unable to identify why or recall any source of memory about that intentionally.


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