Henry Molaison (H.M)

Henry Molaison (H.M)

1. Had severe epilepsy.

2. Had brain surgery to attempt to cure his epilepsy in which his hippocampus was removed.

3. He lost the ability to transfer information from the STM to the LTM.

4. This meant he couldn't make any new long term memories.

5. This suggests that there is multiple parts to the LTM.

6. H.M could still develop new skills eg. mirror drawing.

7. Showing he still had some long term ability.

8. From this we know that there is a procedural and a declarative memory in the LTM.

9. Procedural memory is knowing how (this is what H.M had).

10. Declarative memory is knowing what (this is what H.M didn't have).