Ghosts in the Machine: how our ears can deceive us

Our sense of hearing isn't nearly as well developed as our sense of sight. And as we devote less of our brain power to perceiving sounds, it's relatively easy to trick the human ear into hearing things that aren't actually there. The BBC documentary 'Ghosts In The Machine' explores some of these audio hallucinations, with host Laurie Taylor entering a rabbit hole of electronic voice phenomena (EVP) research to explain strange noises found in recorded sounds. ('Ghosts in The Machine' is presented by Laurie Taylor and produced by Steven Rajam for BBC Wales).