Quote Originally Posted by becomingagodo View Post
visual imagination that what it is see your mind become unconscious sleep and then you get visual spasm from your part of your brain called visual cortex. see your visual cortext become very active during sleep this produces dreams and good case would be woman who had a very vivid dream then loss the abillity for her visual cortex to work when sleeping so she had no dream. see dream are just visual cortex or visual part of your brain which randomly get activated i got this from newscience.
[/b]

It is obviously more than just visual. As you described, imagination and spasms.
What are these derived from?
That does not directly answer the question, does it? Activated by........Conscious or subconscious?