Over the next few days I'm going to be working on the framework of a story for a screenplay. I love this stage in the writing process - right at the beginning when all things are possible.
Writing involves all parts of the mind. Logical thought. Planning. Sensuality. Emotion. The random stuff thrown from the unconscious / subconscious mind. But different stages in the writing process seem to rely more heavily on different aspects. For example, writing close-in description is for me a very sensual process. By which I mean, I have to sense the scene that I am describing. If I am describing a scene in a field of long grass, I have to put myself into it so that I can feel the touch of the grasses, smell the air, be warmed by the sunshine.
And the process of writing the lead-up to the climax of a novel (Act 3, if you like) is one that relies on the conscious, logical mind. I know where the story is going. I am by that stage joining the dots. My subconscious mind may throw in strange ideas, but there is little opportunity to deviate from the existing plan.
Conversely, the opening of a novel or the first stages of planing a screenplay allow huge scope for the subconscious. And that is fun. You never know where it is leading.
There is one more stage to mention. The resolution of a story - after the climax. This is the place where we see how the events of the story have touched the surviving characters. When I am writing a novel, I don't usually know in prospect what will happen in the last half chapter. For that I have to rely on my emotions to guide me and I only know when I get there.