Your internal experience of consciousness – your rich inner life — has had scientists and philosophers completely perplexed for centuries. How does your brain's 100 billion neurons conjure up that distinct sense you have of being YOU? Is it different to your dog's sense of being a 'doggish'? Could that sense be reproduced in artificial intelligence? What happens when you experience altered states of consciousness - take a psychedelic, go under an anaesthetic, or hallucinate? Neuroscientist and bestselling author Anil Seth and psychologist Olivia Carter are on the case, and join Big Ideas host Natasha Mitchell.