I’m always looking for ways to improve my thought processes and abilities. Consequently, I’ve stumbled on this article which claims to be able to help you develop independent thought. While I haven’t gotten a chance to try the technique, I use a method similar to the one presented. I have a feeling their system is probably credible.

Semi-related video: V. S. Ramachandran speaks about synesthesia, brain functioning and other related topics. Very good watch. Big version here.