Bipolar Filters Are Hazardous

When I think of my brain I'm simply amazed at what it does. It hears words and conversations, then stores them in its memory. My brain records everything I see and stores that in my memory too. It records information, files the information and then retrieves it whenever I ask for it. And, it the mean time my brain controls my heart beat and breathing. So, how can I explain the fact that my brain won't let emotions in?
When I say filters, I'm not talking about coffee filters or the kind that keeps your engine oil clean. I'm talking about the filters that block emotions from entering my brain.