When memories are not revisited, they simply fade away as time passes. this exemplifies the

When memories are not revisited, they simply fade away as time passes. this exemplifies the "decay theory of forgetting".

Decay theory suggests that memory blurs because of the unimportant section of time. Data is hence less accessible for later recovery over the long time and memory, and also memory quality, wears away. When we gain some new useful knowledge, a neurochemical "memory trace" is made.