Foster, who was 12 at the time, recalled awkward lunches where De Niro remained in character as a mentally declining army vet, leaving them with little to discuss.
De Niro eventually explained his process to Foster, which she described as an "epiphany" that profoundly changed her understanding of acting.
This interaction helped Foster realise that building a character was a distinct process from merely delivering lines and acting naturally.
Foster has also previously stated that both Scorsese and De Niro were somewhat intimidated by her young age during the filming of her controversial role.