When you get up in the morning and just before sleep, you are naturally in this state. When you close your eyes your brain automatically starts producing more alpha waves. Many studies monitoring the EEG activity of experienced meditators have revealed strong increases in alpha activity.
Bottom-up processing happens when someone tries to understand language by looking at individual meanings or grammatical characteristics of the most basic units of the text, (e.g. sounds for a listening or words for a reading), and moves from these to trying to understand the whole text.
Skimming and Scanning. Your perceptions of any written text are deepened through familiarity. One of the most effective methods for beginning the kind of thoughtful reading necessary for academic work is to get a general overview of the text before beginning to read it in detail. By first skimming a text, you can get a sense of its overall logical progression.