A type of Reality Disorder.
When someone doubts the Base Reality is in fact the Base Reality, or even a tangible reality at all. While most common among CAIE Troubleshooters it isn't unique to them. Reality Rejection is rarely standalone, is often caused by another disorder, and has varying degrees of intensity. Low level Reality Rejection might manifest as an unease when interacting with one's body, high level Reality Rejection could include complete disregard for life or personal physical wellbeing.