Reality Perception One's concept of self, and the way the world would appear to work, evolves over time. By adulthood, most people have a stable, broadly similar 'model of the outside world' and 'self concept'. Some however, do not. The consequences can be profound and tragic. Schizophrenia A global disturbance of perception and thought.
Emotional expression is blunted or inappropriate for a given situation.
The thought processes become ponderous, but disconnected almost to the point of randomness. Like depression, eating and sleeping requirements can vary wildly. Like OCD, rituals and rumination are commonplace. Delirium A common occurrence during other illnesses, e.g., after major surgery. Orientation to time, place and person is usually lost.