system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How are our minds able to imagine a person saying something in their voice that they've never said?

To give an example: Let's say I'm thinking about my best friend. How is it that I can make my brain say something like, "Stay Classy, San Diego," in his voice without him never having said that before?
gpt
Your brain can remember the nuances of your friend's voice well enough to recreate an approximation of it from memory. Your brain is very good with patterns, so it an fill in the blanks even if you've never heard him say those exact words in that order. It's a lot like thinking of an object even though you aren't actively looking at an example of that object.