Neuromasochism 

The process by which one derives pleasure from doing things that makes one's head hurt, particularly as applies to such pains from thinking very hard and/or attempting to reason through a very difficult problem.

Bob wants to learn to speak Latin fluently. I never knew he was in to neuromasochism!

Neuromasochism by Korith October 18, 2008

neuromasochist 

Deriving pleasure from torturing oneself with brain intensive activity.

Judging from her incredible Sudoku skills and massive literary workload, she is clearly a neuromasochist.

neuromasochist by Skip the salubrious January 28, 2008