As a child, you may have had the common experience of being reprimanded by an adult for the one thing that was not in place against the backdrop of everything else that was OK. For example, the one bucket that you didn’t put away, or the one unwashed plate left in the sink versus all the chores you did do. Mom comes home and without acknowledging any of your other efforts, focuses on that one thing undone. Or take for example a task or performance you did and you receive comments/feedback. If there is a comment amidst other great reviews, you would tend to get hung up on that one negative piece. You give a good presentation (for the most part) that is marred by a slip-up. When you’re done, what are you likely to fixate on - you slip-up right!