Qualia

Sensory receptor nerves respond to external stimuli like light and sound. These are exteroceptor  nerves. This defines what we mean by the concept "to feel." Sensory receptor nerves can also respond to internal stimuli like blood pressure. These are interoceptor nerves. Perhaps what we call qualia are the triggering of other interoceptor nerves, nerves that respond to various other types of internal stimuli. Again, they are what we "feel."The simplest example of this might just be the state of a hidden layer in a neural network feeding back to the input layer, i.e., an Elman network.