Amnesia (from Greek Ἀμνησία) is a deficit in memory caused by brain damage, disease, or psychological trauma. Essentially, amnesia is the loss of memory. The memory can be either wholly or partially lost due to the extent of damage that was caused. There are two main types of amnesia, retrograde amnesia and anterograde amnesia. Retrograde amnesia is the inability to retrieve information that was acquired before particular date, usually the date of an injury or operation. This usually occurs after the date of an accident or operation In some cases, the memory loss extends back decades. In other cases the person loses only a few months of memory. Anterograde amnesia is the inability to transfer new information from the short term store into long-term store. People with this type of amnesia can not remember things for long period of time. These two types are not mutually exclusive. Both can occur within a patient at one time. Case studies, such as patient R.B., show that both types of amnesia can occur simultaneously. These case studies also show that amnesia 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, amnesia can occur.

People suffering with amnesia may still be able to form new memories. Studies have shown that patients can learn new procedural knowledge. In addition, priming (both perceptual and conceptual) can assist amnesiacs in the learning of new non-declarative knowledge.

Read more about Amnesic:  Discovery of Amnesia, Causes of Amnesia, Types of Amnesia, Acquisition of New Memories, Treatment

Other articles related to "amnesic":

Priming (psychology) - Effects of Brain Injuries - Amnesia
... Amnesic patients are described as those who have suffered damage to their medial temporal lobe, resulting in the impairment of explicit recollection of everyday facts and events ... Priming studies on amnesic patients have varying results, depending on both the type of priming test done, as well as the phrasing of the instructions ... Amnesic patients do as well on perceptual priming tasks as healthy patients, however they show some difficulties completing conceptual priming tasks ...
Indirect Tests Of Memory - Word Stem Completion (WSC) Task
... the WSC task to examine the memory of verbal material in amnesic patients ... They asked amnesic participants to read a list of words three times and then tested them on recall, recognition, fragmented words or a WSC task (the first ... They found the amnesic participants to be worse than controls on recall and recognition, but performed equally to control participants on fragmented words and ...
Procedural Memory - History
... of work, one focusing on animal studies and the other to amnesic patients ... (1962), by demonstrating that a severely amnesic patient, Henry Molaison, formerly known as patient H.M ... by refining and improving experimental measures, there has been extensive research using amnesic patients varying locations and degrees of structural damage ...
Evidence For The Separation of Implicit and Explicit Memory - Implicit Memory in Amnesic Patients
... a separation of implicit and explicit memory focuses on studies of amnesic patients ... As was previously discussed in the section on procedural memory, amnesic patients showed unimpaired ability to learn tasks and procedures that do not rely on explicit memory ... In one study, amnesic patients showed a severely impaired ability in verbal long-term memory, but no impairment in their memory for learning how to solve a certain motor task called a pursuit rotor ...