In reply to SenzuBean:
I agree that visualisation is an important skill in sport, but personally in climbing I tend to use it mostly in redpointing where I've worked the moves already. I guess looking at the holds and figuring out a possible sequence from the ground involves some form of visualisation in itself. I used to sketch routes and try to visualise moves in competitions, and I think it works better when onsighting indoors as the holds are generally easier to see. I've added a quick line in about route mapping.
Interestingly, I reckon I tend to imagine how I will be feeling/how I should 'act' at certain sections on an onsight attempt rather than what the exact moves will be, especially if the sequence as viewed from below is a bit vague.
Post edited at 23:27