I looked up a book called:
Essentials of Strength training and conditioning, edited by Thomas R. Baechle and Roger W. Earle. On the chapter "The Psychology of Athletic Preparation and Performance page 193 - 194 is also discussion about left and right side of the brain. Looks like it's more than just a "crazy drawing book" thing!

Big thing is that the drawing book teaches how to shift your dominance to the right side, which seems to be more efficient in golf.

Hannu - again...