Practical example of this that affects millions: people with #ADHD Have less dopamine in their brains (oversimplification). Dopamine is one of the things that must be present to form a memory. Less dopamine = fewer memories (again, oversimplification).
ADHD people are incredibly forgetful and spend our lives being gaslit by people in our lives who have heard these 🐄💩 lines, and parroted them without thinking.