Article is not bad but is not entirely accurate especially when discussing conditions addressed. Neurology and Psychiatry were historically the same field. In fact many of the founding fathers of modern Psychiatry were in fact Neurologists (e.g. Sigmund Freud). They also have the same board diploma (American Board of Psychiatry and Neurology). The fields began to move apart as psychiatry moved towards psychoanalysis and development of psychotherapy. However both specialties have been coming back towards each other over the decades with psychiatry returning to its medical roots. Both treat disorders of the central nervous system with the key difference not being whether something is physical or not as most psychiatric disorders are believed to have physical or biological underpinnings (e.g. schizophrenia is a neurodegenerative disorder). Broadly stated Neurology's focus is treating disorders of movement and sensation whereas Psychiatry's focus is treating disorders of thoughts, emotions, and behavior. Dementia is actually treated mostly by psychiatrists and not neurologists. Dementia units are exclusively run by (geriatric) psychiatrists. Psychiatrists are consulted on medical-surgical floors to distinguish dementia and delirium typically not neurologists, for example. Neurologists until recent years were not required by ACGME (Accreditation board for training) to have any training in psychiatric disorders or cognitive disorders such as dementia, though some residencies did (and it was always available as an elective rotation). Now they are rquired to have 4 weeks of clinical psychiatry but are only required to see one dementia patient during their residency (most will encounter more of course). Psychiatry residencies mandate months of geriatric psychiatric training on specialized units and outpatient clinics which care for mostly dementia patients. Dementia as a cognitive (thought) disorder mostly falls on psychiatry. An entire large section of the DSM-V (diagnostic bible of psychiatry) is dedicated to properly diagnosing different types of dementias and cognitive disorders). But neurologists can and do implement medical treatments for dementia patients as well in the real world. There is overlap with other central nervous system disorders as well such Parkinsons, Huntingtons, and stroke patients who will have both neurological and psychiatric symptoms.

My 2 cents, neurologists cover a broad spectrum of diseases,.though mainly related the nervous system,..Psychiatrists take care of medical and related non-medical illnesses also