Thought disturbance characterized by disconnected thinking, manifested by rambling speech in which the patient’s train of thought cannot be followed. Formal thought disorder was first described by the German psychiatrist Kurt Schneider and later elaborated on by various authors. Looking for evidence of formal thought disorder is part of every mental state examination. It includes loosening of associations (see association of ideas), omissions, and knight’s-move thinking.
Subjects: Medicine and Health.