<So when you say, “I doubt everything” that MEANS to me that you do nothing.>

It just means that memory and perception are provisional or even probabilistic.

So, when you put your feet out to the floor in the middle of the night, do you 
doubt that the floor is there?

I do doubt that it is safe for me to put my feet down, because I know the floor 
can be obscured by my big dog Lorenzo who likes to sleep there, but not all of 
the time.   If there was a huge thunderstorm and hours of rain before I went to 
sleep if I might not be hugely surprised to find water on the floor.   If I 
recently cleaned the room, I might move the bed a few centimeters and that 
would be enough to invalidate my motor memory and I might bang my head on the 
bedpost.  (I’ve done this.)

< Here’s an example.  Because of my recent bout of vertigo, I have moments of 
doubting that the world around is stable.  Under those conditions, I cannot 
walk.  REAL doubt (sensu pragmatico) is a nasty business. >

I sometimes have very low blood pressure if I wake-up at an unusual time.   I 
may find on the way to get a glass of water I’m in the process of passing out.  
 The first time that happened it was a surprise, but now I start getting my 
head down realizing that there are just seconds of consciousness left if I do 
not.   At no point do I think the lighting in the room is changing because I am 
experiencing tunnel vision or that I’m on a roller-coaster because I feel my 
stomach drop.

If the relationship between signals and their consequences become low-quality, 
one can adapt to be more model-based.  Not because the models are true, but 
just because the alternative is worse.  If you are saying that in the situation 
that perceptions and thoughts are both doubted, then then it is not skepticism, 
it is madness.

Marcus
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