All mammals have two separate brain hemispheres, each with an emotional and thinking module of cells. The Left hemisphere processes from the external... Am I safe? .... The Right brain thinks in the present moment. Do it now. It's me having a second glass of wine, ignoring the past (how it ruins my sleep) or future (how will I feel tomorrow)?
Richard Davidson, a neuroscientist, says that "time and again our mind makes up all kinds of shit that has no basis in reality." Our perceptual world, how we see things, is dramatically influenced by our brain and filtered by experiences.