Many of us talk to ourselves in our heads pretty much all day long. But it turns out that there are plenty of people who don’t. In fact, thinking comes in many shapes and sizes, and no two minds are exactly alike. In this episode, we explore the peculiar world of how we think, and consider the pros and cons of inner speech. Featuring psychologists Charles Fernyhough and Russell Hurlburt, and lots of 20K listeners. Watch our video shorts on Youtube, Instagram, and TikTok. Follow us on Reddit, Twitter, and Facebook. Sign up for Twenty Thousand Hertz+ to get our entire catalog ad-free. If you know what this week's mystery sound is, tell us at mystery.20k.org To learn more about this topic, check out Charles’ book The Voices Within, and Russell’s book Investigating Pristine Inner Experience. Go to indeed.com/hertz to start hiring today. Visit babbel.com/20k to get 55% off your subscription. Find the right doctor, right now with at zocdoc.com/20k. Visit shopify.com/20k and sign up for a one-dollar-per-month trial period. Support us by supporting our sponsors at 20k.org/sponsors. Episode transcript, music, and credits can be found here: https://www.20k.org/episodes/voiceinside Learn more about your ad choices. Visit megaphone.fm/adchoices