hmm...you guys have a really interesting discussion here.
i am unable to relate scientifically if positive thinking helps but deep inside me, i know it does. in fact many very successful men and women have attributed their success as a result of their positive thinking!
one man that i know of is bob proctor. recently i chanced upon a free interview report done with bob himself and i thought it was really an interesting read.. if you guys are keen, you can grab a free copy at
http://www.abundancemanifesting.com/freereport while it is still available.
hope it helps to shed some pointers in our discussion here