In reply to UKC Articles:
Absolutely! Just watching random climbing vids and hearing "Allez" being shouted repeatedly and in varying accents won't do it, though.
Visualization has long been a big part in other sports, in judo we did this back in the 1980s with VHS videos: Watch a specific opponent you a re preparing for being thrown, and get the reflexes honed to do it yourself as well!
While I am not yet allowed to be back on the mat as a fat, ageing, amateur judo player, I did study videos from the ongoing tournaments, and tried some new techniques I saw there purely mentally, lying in bed with my eyes closed.
These videos included both plain coverage of the fights, and also videos training videos analyzing specific techniques, in particular throws.
Last weekend I could finally try out a few of these throws with my son, and they indeed worked first time round. I am therefore sure I will have a head start when the mats will open again.
There is no reason why the same would not work for climbing as long as a) the videos are specific enough, and b) you have the body awareness and training to effectively "translate" what you see into motor sequences that you can then practise without actually executing the movements.
CB