In __________, mental processes such as thoughts, emotions, memory, consciousness, even knowledge of one's own identity-the processes that make a person feel whole-may seem to be split off from one another.

A) glycogen storage diseases
B) the somatoform disorders
C) lysosomal storage diseases
D) the dissociative disorders

The dissociative disorders involve a disruption or dissociation of normal mental processes, leading to a sense of disconnection from oneself, one's surroundings, or one's own thoughts and experiences. This can result in a fragmentation or splitting of mental processes, such as memory or identity, and can manifest in conditions such as dissociative amnesia, dissociative identity disorder (formerly known as multiple personality disorder), and depersonalization disorder. The other answer choices refer to different kinds of medical conditions that do not involve this kind of dissociation or fragmentation of mental processes.