Symptoms of geriatric mental disorders are divided into two categories: 1) functional mental disorders, commonly known as psychiatric disorders, with symptoms of hallucinations, delusions, and affective disorders, such as hallucinatory experiences such as hearing voices out of thin air and hallucinations of vision; 2) organic mental disorders, with symptoms of dementia, delirium, or personality changes. Early symptoms of dementia are manifested as near memory loss, especially recent memory loss, and there may also be misconfigurations and errors in judgment of people, time, and place. As the disease progresses it manifests as a decline in executive ability and inability to perform normal work and household chores.