What is meant by memory while under amnesia ?

Amnesia or amnestic syndrome is referred to as an inability to hold and keep memories. Individuals with such conditions are aware of their well-being and their own personality but find it very difficult to learn and form new information, facts and experiences. It is generally caused by a trauma or damage to the area of the brain that regulates memory processing or due to any neurological or psychological disorder. There are four different types of amnesia-

1) Anterograde amnesia

2) Retrograde amnesia

3) Infantile amnesia

4) Transient global amnesia