 Damages to layers five and six can be detrimental to the overall fitness of the mammal, usually resulting in some form of retardation or loss in cognitive processes.These six layers of the neomammalian brain work interdependently to process neurological messages at an extremely fast and high-quality level.These six layers are only found in the modern day human brain; however, other higher order mammals have features of these layers that give allow them to have a high cognitive processing ability.