http://medicalxpress.com/news/2016-03-bad-decision-anxiety-blame.html

Most people experience anxiety in their lives. For some, it is just a bad, passing feeling, but, for many, anxiety rules their day-to-day lives, even to the point of taking over the decisions they make.

Scientists at the University of Pittsburgh have discovered a mechanism for how anxiety may disrupt decision making. In a study published in The Journal of Neuroscience, they report that anxiety disengages a region of the brain called the prefrontal cortex (PFC), which is critical for flexible decision making. By monitoring the activity of neurons in the PFC while anxious rats had to make decisions about how to get a reward, the scientists made two observations. First, anxiety leads to bad decisions when there are conflicting distractors present. Second, bad decisions under anxiety involve numbing of PFC neurons.