There are some things that many of us take for granted - such as knowing when we are hot or cold, feel hungry, or need to go to the toilet. But how do we know these things, and why do some people struggle to recognise them? Interoception - the ability to identify and act on physical sensations inside the body - is crucial to human well-being. It underpins physical developmental milestones, such as toilet-training, as well emotional ones, such as the...