Dementia praecox is a term in Latin which Emil Kraepelin invented and contrasted with a mental illness called manic-depressive insanity which is re-described as Bipolar disorder today. For Kraepelin and other psychiatrists, people diagnosed with manic-depressive insanity often had episodes in which they seemed normal, while people with dementia praecox did not. Dementia is a mental illness which mostly occurs in old people. view more...