The first stage is selection, when the perception is focused on something: 2. Carl was working on his homework. In the background, a man began speaking. Carl stopped to listen.
The second stage is organization, when we structure our thoughts around what we focused our attention on: 1. The man's voice was coming from the radio. The voice sounded familiar.
The third stage is interpretation-evaluation, when we use our knowledge to interpret and extract information from what we focused our attention on: 3. Carl remembered that this was the night that the president was to give his State of the Union address. He was hearing it now.
