"a memory with both auditory and visual components ... will elicit essentially the same neural responses..." #readingToday
When you remember a situation, the parts of the brain that were activated by sensory inputs (taste, touch, smell, etc.) when you originally experienced the situation become active all over again. This means a memory with both auditory and visual components, such as talking to a friend, will elicit essentially the same neural responses in the auditory and visual cortices as happened when you had that conversation in the first place. Your brain is literally reliving the memory. This is critical for the concept of memory consolidation, and it is also critical for the idea of memory replay during sleep.
(Moon+ Reader Pro v2.3.3, The Secret World of Sleep: The Surprising Science of the Mind at Rest (MacSci))