The first process is called deletion. We delete lots of information from the environment around us as well as internally. In his 1956 paper entitled Seven Plus or Minus Two, George Miller, an American psychologist, said that our conscious minds can only handle seven plus-or-minus two bits of information at any one time, and that we delete the rest. That means on a good day we can deal with nine bits in total and on a bad day, maybe only five.
