Many people, reading a book and looking back for a previous section, will retain a visual memory of exactly whereabouts on the page the sought-after words would be. If you can't do it I'm sorry. But it is not uncommon. I can do it.
Last week I was out walking by myself and listening to a Podcast. Half way across a field I met a friendly stranger who informed me that the next field contained a bull. He didn't recommend going across that field and asked me if I knew another way round. I did, but it was complex so I showed him and we walked together and chatted until we parted company maybe ten minutes later.
At this point I returned to my Podcast. I found that, although I had removed my earphones, I had not paused the programme.
I rewound a few minutes and listened. I recognised a piece I had already heard. I had rewound too far. Here's the weird moment. I knew exactly where I had been on my walk when I heard that bit. Precisely. It was about 300 yards before I met my new friend. I fast-forwarded a bit, but not far enough because again, I knew where I had been walking when I heard that bit. I got there in three.
Incidentally I had been listening to a Podcast about words so I note, in passing, how 'fast-forward' and 'rewind' are wedded to the days of tape recorders. I should find new words for what I do with my finger on an iphone touch-screen.
But is this phenomenon why memorising decks of cards etc works well if you imagine a journey to find them? Do any of my smarter friends have the explanation?