These names are older and nearly obsolete general terms from psychiatry, referring to many physical disorders that cause impaired mental function.

An organic cause to brain dysfunction is suspected when there is no indication of a clearly defined psychiatric or "inorganic" cause, such as a mood disorder.

[8] Amnestic conditions denotes a gray zone between delirium and dementia; its early course may fluctuate, but it is often persistent and progressive.

[12] The more common symptoms of OBS are confusion; impairment of memory, judgment, and intellectual function; and agitation.

Treatments can include, but are not limited to, rehabilitation therapy such as physical or occupational, pharmacological modification of the neurotransmitter function, or medication.

[18] The affected parts of the brain can recover some function with the help of different types of therapy, or tractographical psysurgery.

[20] Rest and medication are the most common courses of action for these treatable cases to help the patient return to proper health.