Spiderman Tech - What is 'Spider-sense"?

Spider-sense - what does this look like? Would the world around you go in slow motion or is it like a radar that would permit additional reaction time to sense motion around you? How would it help Spiderman detect danger on the horizon? Do real spiders actually have a 'spider-sense"?

This could be explained through a spider's ability to sense vibrations and changes in air pressure. Spiders can feel things approaching be sensing changes in the environment. Maybe Spiderman can sense these changes through the use of trichobothria (a really fine hair that can perceive air currents and vibrations).

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