Colin MacLeod and colleagues have shown repeatedly that words read aloud are remembered better than words read silently: the production effect. A 2018 study compared several methods and found reading aloud to yourself beat both silent reading and listening to a recording. Saying a word makes it stand out in memory.
Remembering is not replaying a recording — it is rebuilding. Each time you recall a memory, it becomes temporarily malleable and can be altered before being stored again. That is why two people can sincerely remember the same event… differently.
In 2003, Johnson and Goldstein compared European countries. Where you must tick a box to become a donor, consent rates ranged from 4% to 28%. Where you're a donor by default unless you opt out, they topped 85%. People aren't more generous on one side; most simply stick with whatever option was chosen for them.