it does not jog memory... it makes up memory...
I was a witness, as a jump seat rider, to an aircraft accident. I gave what I thought was complete statement to NTSB. Nine months later, while prepping for Fed court testimony, I saw a diagram and transcript that almost made me feel like I was there again. I had read the NTSB conclusions, and was able to conclusively refute them, backed up by two of the three crew members. None of us had recollected the precise moment until reading the transcripts, which made us think "what was I seeing when that statement was made?"
Our testimony saved Delta about $10,000,000.