Probably the same way some people have Aphantasia (the inability to visualize things in one’s mind). Those of us who can do it can’t imagine what it would be like to be unable to do it, and those of us who can’t do it can’t really imagine what it would be like to do it. Brains are kind of weird and they can function in all sorts of weird varying ways from person to person.
Like, take someone who was deaf from childbirth… unable to hear, unable to know what words ***sound*** like. What would their internal monologue be? Images? Sign language? A rolling ticker of words? (I’m admittedly now really curious as the answer to this)
Things like this tend to be really hard to explain precisely because brains can be wired differently from person to person. It’s like trying to describe a sense (like taste, sight, sound, smell, etc) to someone who couldn’t utilize that sense from birth. They have no reference point to compare it to, so they cannot really imagine what it’s like… or vice versa with us, having that sense, what it’s like to develop without it.
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