Not sure what you mean here. Psychosis induced by AI will look much like psychosis induced by anything, because it's always personalised to the sufferer.

Anyone can be pushed into psychosis with the right triggers and the right circumstances. It is difficult to predict, and it is not inherently a symptom of any other undiagnosed mental illness. The triggers can be almost anything, and the circumstances as commonplace as extreme stress — severe debt, severe illness of a parent or child, losing a job you depend on, anything. Often in the context of chronic tiredness or other things that alter mental states. Persistent inescapable loud noises can do it, for example, as well as drink and both illegal drugs and some quite common medications like corticosteroids and antihistamines.

You don't have to be already mentally ill to become psychotic. It's an illness itself. Transient psychotic episodes aren't that uncommon — one in twenty, one in fifteen people maybe will have one in their lifetimes.

Whether AI is always the only trigger in an AI psychosis, or whether AI is a new circumstantial environment, who knows.

But it is clear that AI can contribute to psychosis in people who were otherwise in control of their lives in stressful circumstances. It's not difficult to see how an infinite confirmation machine that never has any instinct to stop reinforcing your thoughts or impulses might cause and exacerbate a psychotic episode in people who have quite ordinarily heavily stressful lives.