Anterograde Amnesia

Anterograde amnesia is a loss of the ability to create new memories after the event that caused amnesia, leading to a partial or complete inability to recall the recent past, while long-term memories from before the event remain intact. Amnesia is an inability to lay down new memories, recall old memories, or both People with amnesia also find it hard to remember the past, memorize new information, and imagine the future. This is because we construct future scenarios on the basis of our recollections of past experiences.

Our ability to recollect events and experiences involves a variety of complex brain processes. We still don't understand exactly what happens when we commit something to memory, or when we try to retrieve data stored in our brain.

        • TYPES  OF  AMNESIA :-

• Anterograde amnesia: The person cannot remember new information. Things that happened recently and information that should be stored into short-term memory disappear. This usually results from a brain trauma, when a blow to the head causes brain damage, for example. The person will remember data and events that happened before the injury.
• Retrograde amnesia: In some ways the opposite of anterograde amnesia, the person cannot remember events that occurred before their trauma, but they remember what happened after it. 
• Transient global amnesia: A temporary loss of all memory and, in severe cases, difficulty forming new memories. This is very rare and more likely in older adults with vascular (blood vessel) disease.
• Traumatic amnesia: Memory loss results from a hard blow to the head, for instance, in a car accident. The person may experience a brief loss of  coma. The amnesia is usually temporary, but how long it lasts normally depends on how severe the injury is.
• Wernicke-Korsakoff's psychosis: Extended alcohol abuse can lead to progressive memory loss that worsens over time. The person may also have neurological problems, such as poor coordination and a loss of feeling in the toes and fingers. 
• Hysterical amnesia: Rarely, a person can forget not only their past but also their identity. They may wake up and suddenly have no sense of who they are. Even if they look in the mirror, they do not recognize their own reflection. A driving license, credit cards, or ID card will be meaningless. It is usually triggered by an event that the person's mind is unable to cope with properly. The ability to remember usually returns either slowly or suddenly within a few days .
• Childhood amnesia : The person cannot recall events from early childhood, possible because of a language development problem or some memory areas of the brain not fully maturing during childhood.
• Posthypnotic amnesia: Events during hypnosis cannot be recalled.
• Source amnesia: The person can remember certain information but not how or where they got that information.
• Blackout phenomenon: A bout of heavy drinking can leave a person with memory gaps, where they cannot remember chunks of time during the binge.
• Prosopamnesia: The person cannot remember faces. People can either acquire it or be born with it.