system
Given the following post, respond as if you're commenting on Reddit:
human
How exactly are memories forgotten, and where do they go?
gpt
Short term memory is believed to reside in the hippocampus. If a memory is deemed "relevant", then it is crystallized into long-term memory, which is believed to be stored in the cortex. As far as why certain memories fade...that is an enormous area of research and debate. A lot of fascinating information about how memory works has come from the study of Alzheimer's disease.