You hear a voice in your head when you're reading, right?
If you think this is interesting, definitely read  "Generalizing From One Example" at Less Wrong [1].<p>Turns out that people have varying degrees of ability to mentally imagine things, where the range seems to be from "purely abstract" to "number of stripes on a tiger".<p>Also; Feynman noted that people keep track of time in very different ways[2], either visual (imagining a clock) or symbolic (counting by talking to yourself inside your head).<p>And that whole internal monologue thing? Turns out that some people report not having that...<p>If anyone has more examples, please add them. This stuff is endlessly fascinating :)<p>[1]<a href="http://lesswrong.com/lw/dr/generalizing_from_one_example/" rel="nofollow">http://lesswrong.com/lw/dr/generalizing_from_one_example/</a><p>[2]<a href="http://generallythinking.com/richard-feynman-on-thinking-processes-did-he-know-nothing-about-psychology-v/" rel="nofollow">http://generallythinking.com/richard-feynman-on-thinking-pro...</a>