Many philosophers consider experience to be the essence of consciousness, and believe that experience can only fully be known from the inside, subjectively. But if consciousness is subjective and not visible from the outside, why do the vast majority of people believe that other people are conscious, but rocks and trees are not? This is called the problem of other minds. It is particularly acute for people who believe in the possibility of philosophical zombies, that is, people who think it is possible in principle to have an entity that is physically indistinguishable from a human being and behaves like a human being in every way but nevertheless lacks consciousness. - Wikipedia
So how does my consciousness work?
INTJs’ dominant function is Introverted Intuition (Ni).
When INTJs express the need to “think about” something, this means something very different from what it might for other types. Namely, the lion’s share of INTJs’ “thinking” or processing occurs outside of their conscious awareness. In other words, their best thinking is typically done without thinking, at least not consciously. http://personalityjunkie.com/the-intj/
Because it does much of its work subconsciously, Ni can seem to have a magical quality to it. In fact, it is not unusual for INJs, particularly INFJs, to be viewed as having some degree of psychic or prophetic abilities. Despite its magical appearance, Ni can be understood on a rational basis. What seems to be occurring is that INTJs have a highly sensitive inferior function, Extraverted Sensation (Se), which gathers copious amounts of sensory information from the outside world, including subtleties that other personality types tend to miss. Their Ni then subconsciously processes this data in order to make sense of it, like assembling pieces of a puzzle. Once finished, Ni generates an impression that seems to come “out of nowhere.” But the fact is that the intuition did not come from nowhere, but from a synthesis of sensory data gathered from the immediate environment combined with information from the INTJ’s own psyche.