The theory behind this thinking is that when the mind is engaged in a track of negative mood, the forced recall of positive memories will break the cycle and force the brain to reorient into a more positive state.[9] There are two ways to recall these memories, abstractly and concretely.[8] An abstract recollection of memories consists of a kind of comparison between an individual's memory and their current situation. This can sometimes be helpful unless the individual suffers from depression. A concrete recollection is when a memory is recalled especially vividly and the individual experiences the phenomenology of this memory more acutely.