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 Consciousness is a critical topic to discuss as its nature is not determined by modern science yet.  Neuro scientists are nowadays are only dedicated to the mystery of consciousness.  Neuroscience has discovered so much about human brain and it's gross aspects like how the brain waves functions ,about how electrical signals transported by nerves and how human nervous system works all together but still can't find the source of Consciousness and reason behind the             "  first person experience ". Neuroscientists proposes that consciousness may come from pre frontal cortex ,which is frontal region( lobe) of human brain .  It has been seen that throughout evolution human brain structure changed  .  During the process of evolution,  ancestors of human race ( Homo sapiens) went through enormous changes in their pre frontal cortex region . It has been claimed by scientific communities based on the findings of skull remains of our ancestors ,that they went through c