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.
Critical Reading [edit]. Critical reading is the first step in a rhetorical analysis. In order to make a reasonable and logical analysis, you need to apply critical reading skills to a text, given source, or artifact that you intend on analyzing. For example, when reading, you can break the whole text down into several parts.