These occur typically in cases of amnesia and frontal lobe disorders.

The dead homunculus (Frontal lobe disorder)

Frontal lobe disorder is an impairment of the frontal lobe that occurs due to disease and head trauma.

Patients with frontal lobe disorder have trouble putting verbal items into a proper sequential order, monitor personal behaviors as well as a deficient judgment in recency.

Adie also published articles on pupillary abnormalities, "forced grasping and groping" in frontal lobe disorders, and narcolepsy.

The Wisconsin Card Sorting Test is widely used in clinical settings to test for cognitive impairments, such as frontal lobe disorder which has been associated with source amnesia.

Bruns ataxia, also known as Bruns gait apraxia, frontal ataxia or magnetic gait, is a form of ataxia found in patients with bilateral frontal lobe disorders.

A few days after the doctor, Allan Zarkin, 61, began work at the clinic, clinic officials received a letter from a psychiatrist hired by Dr. Zarkin's lawyer saying that the doctor apparently suffered from a frontal lobe disorder.

Frontal lobe disorders may be recognized through a sudden and dramatic change in a person's personality, for example with loss of social awareness, disinhibition, emotional instability, aggression, irritability or impulsiveness (for example sexually inappropriate behaviour or spending money impulsively).

This comes in two, not mutually exclusive, categories: frontal lobe disorder (may present as impulsivity, impaired judgement, promiscuity, apathy and executive dysfunction with poor planning and decision making) and subcortical dementia (may present as slow thinking, memory loss and executive dysfunction, without signs of aphasia, apraxia or agnosia).