Thanks for sharing this.. when I was around 4 years old my parents, a relative, and I were in and out of a hospital.
We were going through a really tough time dealing with a life-altering diagnosis of one of my siblings. A lot of anger and sadness, especially from my parents.
But - the only thing I actually remember from the hospital was playing Galaga in the hospital game room with my relative. Since I was 4 years old, I always wondered (a) why it is such a vivid memory and (b) why I can't remember my family or myself being upset. Quite surreal to see that this specific scenario has been studied.