Balancing Buckets
One of the best analogies I have come across is to think of your sensory system like a bucket. Some people have very large buckets while other people have very small buckets. All of our sensory information (sights, smells, sounds, tastes, movement, tactile information, etc.) goes into the top of the bucket and the holes in the bottom of the bucket allow it to trickle out as we process the information. For most people a bucket that is ½ full is comfortable.