Some changes require a substantive learning process, such as hours of intentional, focused practice. There are other options too, like reading several books over the course of a few months and thinking about it many times during those months. Or you can immerse yourself in a subculture, for months, that's good at the issue. A substantive learning process involves visible actions. If it happened, it should be pretty easy to point to some evidence and activities.
This is a companion discussion topic for the original entry at https://criticalfallibilism.com/substantive-learning-processes/