Interoception means our “perception or sense of internal body states,” including the states of our cardiovascular, digestive, respiratory, and thermoregulatory systems among others.
Proprioception means “one’s own” or “ones’ individual” (Latin proprius) “perception.” We normally use this word to refer to our physical position in the world—whether we are standing or sitting, how we are moving, and how much energy we are using.
Both interoception and proprioception generally refer to physical states of the body though, of course, how we interpret those states may involve much more than immediate physical considerations.
Erroneous interoception or the misinterpretation of internal states is is generally thought to be an important contributing factor to many psychological disorders, including anxiety, depression, panic disorder, and more.
Consider some other levels of interoception—our states of mind; our mental impressions of other people and of ourselves; our senses of our own psychologies.
These levels of psychological reality are normally accessed through introspection, meditation, mindfulness, and psychotherapy. All of these methods are good, but each of them lacks ongoing, real-time input from another human being, thus missing the dynamic functioning of the human mind in real-life situations.
FIML corrects this problem by providing objective, dynamic access to real-time psychological functioning. FIML is a method or tool for optimizing human psychology by honing our perceptions of our mental states as they actually function in real-world situations.