<unk>  is a deficit in memory caused by brain damage or disease, but it can also be caused temporarily by the use of various sedatives and hypnotic drugs. The memory can be either wholly or partially lost due to the extent of damage that was caused. There are two main types of<unk> : retrograde<unk>  and anterograde<unk> . Retrograde<unk>  is the inability to retrieve information that was acquired before a particular date, usually the date of an accident or operation. In some cases the memory loss can extend back decades, while in others the person may lose only a few months of memory. Anterograde<unk>  is the inability to transfer new information from the short-term store into the long-term store. People with anterograde<unk>  cannot remember things for long periods of time. These two types are not mutually exclusive; both can occur simultaneously. Case studies also show that<unk>  is typically associated with damage to the medial temporal lobe. In addition, specific areas of the hippocampus (the CA1 region) are involved with memory. Research has also shown that when areas of the diencephalon are damaged,<unk>  can occur. Recent studies have shown a correlation between deficiency of RbAp48 protein and memory loss. Scientists were able to find that mice with damaged memory have a lower level of RbAp48 protein compared to normal, healthy mice. In people suffering with<unk> , the ability to recall immediate information is still retained, and they may still be able to form new memories. However, a severe reduction in the ability to learn new material and retrieve old information can be observed. People can learn new procedural knowledge. In addition, priming (both perceptual and conceptual) can assist<unk> cs in the learning of fresh non-declarative knowledge. Individuals with<unk>  also retain substantial intellectual, linguistic, and social skill despite profound impairments in the ability to recall specific information encountered in prior learning episodes. The term is ; .
Amnesia
Snatiation
Paranoia
Anhedonia
Allomnesia
Sexual anhedonia
Dyssomnia
Alexithymia