Declarative memory. There are two types of declarative memory: Recollections of experiences, such as the first day we started school, and semantic memory, such as the capital of France. This means that you are aware of the knowledge and can communicate the memories.
Procedural memory, such as playing an instrument or riding a bicycle, is preserved for a lifetime. This system is seldom compromised because the basal ganglia, responsible for processing this memory, is protected in the brain's centre.