What are the two basic types of amnesia and how they different?

There two main types of amnesia:

1. Retrograde amnesia

Retrograde amnesia is the loss of memories that were formed before a certain point in time, usually a traumatic event. The extent of the memory loss can vary, from a few minutes to many years. Retrograde amnesia is often caused by damage to the temporal lobes of the brain, which are involved in memory formation and storage.

2. Anterograde amnesia

Anterograde amnesia is the loss of the ability to form new memories after a certain point in time. People with anterograde amnesia can remember events that happened before their injury, but they cannot remember new information that is presented to them. Anterograde amnesia is often caused by damage to the hippocampus, which is a structure in the brain that is essential for memory formation.