The posterior insula is primarily involved in interpreting internal somatic experience and how movement combines with internal states to create feelings categorized as 'yum', 'yuck', or 'meh'.

“The posterior insula, the back of the insula that is, has a very interesting and distinct set of functions. The posterior insula is mainly concerned with what's going on with your somatic experience. How do you feel internally? And how is the movement that you happen to be doing combining with your internal state to allow you to feel, as I like to say the nervous system mainly batches things into yum, like, "Oh, this is really good for me," yuck, "This is really bad for me and I need to stop," or meh, "This is kind of neutral."”