Again, I liked your prompt this time, Plinky! Do I follow my heart or my head?
Sometimes both, sometimes I follow my heart only, sometimes my head only, sometimes none, and sometimes I just follow my GUT. Depends on the situation. Depends on what kind a problem. Depends on whom I dealing with. Mostly, my first reaction based on my heart but then the action I take was an order from the head with consideration from my heart. So, if my head is the commander, my heart is the adviser. But, if I need to make quick decision, I follow my gut.
For the example, simple case, if I did not intentionally go to the bookstore, first I would choose a book by it's interesting story which my heart seems moved by it, then I look at the price with its thickness – it was my brain whose working, and if there's still a few book left I would choose based on my gut.
Oh my,,, It was my heart who is answer this question,,,, I write without thinking at all…