I am convinced that the unconscious reads faster than than conscious mind. As a matter of fact, in socionics the Vital track (of ring) information flow faster than the Mental track and we realise the effect of our vital track information only afterwards.
That said, sometimes I feel like having a headache when I read some texts (including that of certain forum members). It's difficult do describe but it's probably similar to brain fog. However, this phenomenon has more to do with the perceived lack of fluidity in the writing style than with its content. Some would say that it's a like a gut feeling...
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Now, why did I talked about the unconscious reading ? Because this "brain fog" happens in the first seconds of my conscious reading which means that my unconscious has already "looked ahead" and shown signs of inconfort that somehow leaked and manifested physically before my conscious awareness of the texts style. It's a bit when you touch a very hot object and burn your fingers, you feel the burning after a certain delay of a few microseconds.
I would also compare that unconscious awareness with my adaptability to people's mind. I think there is a certain aspect in people that I unconsciously perceive and once that process is done I start to, for the lack of a better word, energy-shift before being conscious of it. Of course when I talk about energy shifting (some would call that shapeshifting to give it more oomph !), it is not something negative. I think that I unconsciously summon an archetype (whatever it is) that mirrors the energy of my interlocutor. Maybe not exactly but just enough to ease communication flow, no more no less.
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I know that this is weird stuff folks but it's most certainly type related. Do you relate to some of this ?