Blake remembers the strong emotional memories about his relationship with his dad, especially how on the weekends, Blake and his family would do fun stuff like go to the movies, go to the park, and cook big meals together. However, when he remembers those moments, he doesn't really have memories of the weaker emotional experiences such as what color his t-shirts were or what style of haircut he had. These memories of strong and weak emotions can be explained by which theory/hypothesis?