Incoherence is a term used to describe a lack of logical connection between ideas or thoughts. It is often associated with DELIRIUM, which is a state of severe confusion and disorientation. DELIRIUM is characterized by rapid changes in mood, behavior, and cognitive abilities, and can be caused by a variety of medical conditions. Incoherence is one of the symptoms of DELIRIUM, and is defined as a lack of logical connection between ideas or thoughts.