Déjà vu —Moments Relived

Déjà vu, an eerie phenomenon, emanating from memory portions of the brain manifests for only a few fleeting moments making you feel that the moments are being re-lived and leaving you with a pleasant shudder. You strongly feel that you are living the past in the present and you equally believe that it cannot be!! Being a Parapsychologist, I am attracted to phenomena which are out of the ordinary; Déjà vu reminded me of Retrocognition and I wanted to explore the difference between the two phenomena. During the exploration, this remained a small fraction of the research as many other exciting revelations came to the fore. The paper explores the meaning of Déjà vu, how it happens, who is more prone to have this sensation, being a mind phenomenon how it compares with other psychic phenomena like retrocognition and dream precognition, whether it could be harmful, does it have a positive side, and how does the brain get activated while experiencing it?