When prompted with cues, korsakoff's victims can often produce words from lists they saw but claim to have never seen. this exemplifies what kind of memory?

This exemplifies "implicit memory".

Explanation:

There are two types of long term memory, which are implicit and explicit memory.

Implicit memory is a memory which we use unconsciously, which means that sometimes we remember things and we don't have to think about them, they just come into our mind. What we do and what we think, this was also affected by implicit memory.