The theme of memory in Nabokov's Lolita

[SneezingDog]

I was wondering if I could get your guy's take on the theme of memory in Lolita, and how I can expand my understanding on it better. I find it interesting that the narrator, Humbert, who prides himself on his photographic memory (among lots of other things), is reciting the whole account of his misdoings by memory alone. Remember his journal was confiscated. Plus, he is always chasing the memory of the girl from his childhood, which I thought to be important. What else does the theme of memory have to do with in Lolita?

Thanks!