The activation step takes the information that was put into your unconcious mind during the photoreading step, and helps it be recalled into the concious mind. As you go through, notice certain parts that appear important to your purpose for reading the book.
Do multiple 30 minute activation passes, and try building a mind map. Yes, it does/can take multiple passes at times. Build comprehension in layers from whole-to-parts. Notice that it comes at an accelerated rate.
