If the amnesia persists for more than a week, serious brain damage may have occurred. Memory usually returns within a few days. For example, someone who has suffered an injury to the head may be unable to recall the accident or the events that followed but may be able to perform coordinated motions and be aware of his or her surroundings. In anterograde, or post-traumatic, amnesia, events following the incident that caused the amnesia are not retained. AmnesiaĪmnesia, a partial or complete memory loss. (See also Syphilis.)ĭementia praecox is a term coined in the late 1890s by the German psychiatrist Emil Kraepelin for what he then believed to be a single syndrome incorporating the conditions hebephrenia, catatonia, and the deteriorating paranoid psychoses. Antibiotic treatment of the syphilis infection can discourage further nervous system deterioration but will not repair the neurological damage that has already occurred. The mental symptoms of dementia paralytica vary but typically include severe memory loss, impaired judgment, delusions, and paranoia. The period of latent symptoms is often shorter in juvenile paresis, which results from syphilis contracted by the fetus of an infected mother. The onset of mental symptoms usually occurs 10 to 25 years after the initial infection with the syphilis spirochete Treponema pallidum. This article discusses only some types of dementia.ĭementia paralytica, or general paresis, is a meningoencephalitis caused by syphilis of the nervous system. Dementia is to be distinguished from mental deficiency, in which mental functioning never develops on certain higher levels, and from mental arrest, in which mental functioning ceases to develop but does not deteriorate. The term does not denote a single disease but rather refers to forms of brain damage resulting from various diseases or from injury or senile deterioration. Dementia, a severe and permanent deterioration of mental functions.
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