To better understand this concept completely, one must understand the functions of the brain. To summarize it:

Left Hemisphere:
- Language
- Logic
- Interpretation
- Arithmatic

Right Hemisphere:
- Geometry
- Nonverbal processes
- Visual pattern recognition
- Auditory discrimination
- Spatial skills

(From The Brain, Pierce J. Howard, Ph.D., Center For Applied Cognitive Studies)

One most also understand that the brain interacts with it's milieu by utilizing every aspect of the brain. Both hemisphere's are necessary for complete and comprehensive experience. Otherwise, you brink onto alexithymia. Alexithymia dictates that an emotional response is complete if the person is able to (1) to experience emotional feelings (2) to differentiate between various emotional feelings (3) to verbalize his or her emotional feelings (4) to reflect and to some extent analyze these feelings or (5) to fantasize about them. (Reference). Of course this is arguable but logically makes sense.

The term "Agenesis of the Corpus Callosum" defines when there is a abnormal space or complete absence of hemisphere communication. Because of this miscommunication, individuals with ACC will suffer seizures and essential ataxia (loss of the ability to coordinate muscle movement). This causes problems with walking, eating, breathing, articulating, etc. Also, there may be impaired visual and auditory memory (or lack thereof). Worst of all, it is very possible for hydrocephaly to occurr. Hydrocephaly is the abnormal collection of fluid within the missing spaces that may destroy much neural tissue and caues mental disorders. Since ACC is most commonly congenital, there is a great possibility for retardation.

It is these factors that argue alexithymia - do dreams matter if you cannot comprehend them or even remember them? Can significant dreaming occurr in individuals with ACC? "If a tree falls in a forest and no one is around to hear it, does it make a sound?" Keeping in mind that if someone with ACC was nearby they would most likely commit to seizure before anything else.

My point in all of this was to state that the hemisphere's are both equally responsible for dreaming and brain processing. A point that Howetzer made postualtes this further:

Originally posted by Howetzer
While we know that the right brain controls the left side and visa versa.
Both hemisphere's are responsible for every process. Yes, there are certain aspects of the brain that are the neurological initial stage of sensory reception; but if this were the deciding factor on what is the most important and conscious part of the brain, then your answer would simply be the thalamus. If not, then the hippocampus or simply memory.

Also, all organisms have a concept of language and auditory sounds - it's the recognition and association to meaning that is recieved within the human brain. This is merely memory. Consider that other animals still recognize loud and scary sounds, tones (how a dog acknowledges you, etc.), and even some animals have much more advanced hearing and recognition than humans (cats, for example).

I'll stop for now.. hehe.

Hope I've been enlightening. (Or at least interesting)