The amnesia is a memory disorder that can be caused by various reasons, among which are more common: the head injuries, as a side effect of taking certain medications, a strong emotional impact associated with several diseases such as brain inflammation (encephalitis), lack of oxygen to the brain, brain tumors, Alzheimer's (which is a progressive dementia characterized by progressive loss of memory) ... Besides the amnesia may be temporary (transient amnesia) or permanent, and can be of two types, depending on the symptoms present: anterograde, if it causes a difficulty to memorize new data; or retrograde, characterized by forgetfulness of memories. On the other hand, consist paramesias recognition errors memories, as reminiscence, called "Dejavú" or cryptomnesia, among others.