People with Complex PTSD suffer from more severe and frequent dissociation symptoms, as well as memory and attention problems, than those with simple PTSD. In addition to amnesia due to the activity of various parts of the self, people may experience difficulties with concentration, attention, other memory problems and general spaciness. These symptoms often accompany dissociation of the personality, but they are also common in people who do not have dissociative disorders. For example everyone can be spacey, absorbed in an activity, or miss an exit on the highway. When various parts of the personality are are active, by definition, a person experiences some kind of abrupt change in attention and consciousness.