[Quiet Man Cometh]

If you're interested in some of the potential physiology behind this stuff, go look into amplifying/inhibiting senses. I find it quite interesting. In a nutshell, amplifiers have brains that increase their sensory input, while inhibitors will experience a decrease in sensory input.

Consider being in an otherwise quiet room with an electronic thing turned on somewhere, like a TV, but no show is playing. You ever hear that annoying little whine that running electronics make? Some people can, some people can't, depending on what their brain does to the sound as it's coming in. The same can go for colour, excitement, etc. Adrenaline junkies tend to have inhibiting brains, so it takes more excitement to get the same rush an amplifier might have with a book or movie.