Answer:
When an individual forget of owning a bike but does not forget how to ride it.
Explanation:
Amnesia is considered to be a general term used for memory loss. And retrogate amnesia is one of the examples of amnesia which can be described or explained as a situation whereby the memories that were formed before the onset of amnesia are affected.
In this aspect,the memory loss usually involves fact and not skills.
The retrogate amnesia is known to be caused when there is damage to the memory-storage parts of the brain, which are located in various regions.
