Originally Posted by Roze
I'm a little lost here. I don't really understand what you're trying to say. And I also don't know the meaning of 'alpha' and 'theta'...
Our consciousness operates at a range of different levels throughout the day. For example, your consciousness, when you are angry and excited, is different from your consciousness when you are calm and relaxed, and this in turn is different from your consciousness when you are asleep and dreaming.
Alpha, beta, delta and theta represent different ranges of brainwave frequencies which reflect the above. This may be helpful: The Measurement of Brain Waves
For the kind of visualisation you plan to do, you should be getting yourself into the mid to deep alpha range. This can be done by various different techniques such as progressive muscular relaxation; slow, deep breathing exercises; meditation, or various other hypnotic techniques.
At the deeper states, you'll find that your ability to visualise begins to expand. The challenge is that you have to stay awake and retain enough alertness to direct your visualisation.
For example, when you are dreaming, you are actually visualising with great power and vividity - such that you can generate fantastic images, a plot, other human characters who talk, move, run around, interact with you - but generally you are not in control of the process.
(Note - your LOA attempts to use creative visualisation will probably not approach anything close to the vividity of your dreams. Doesn't matter, creative visualisation can be an extremely, extremely powerful tool, without you actually having to attain the vividity of your dream-state.)