Behavioral neurology is primarily concerned with the neurological causes of degraded behavior following disruption of higher brain function. In the early 1970s, it re-emerged as a subspecialty of neurology focused on diagnosing and treating patients with damages, diseases, and disorders of the nervous system and related tissues that alter normal behavior. While some practitioners have studied congenital diseases and geriatric dementias, behavioral neurology came to overlap extensively with the fields of neuropsychiatry and neuropsychology, differing primarily in the degree of medical diagnosis and treatment of patients. The major advances in neuropsychology and neuropsychiatry are thus part of the history of behavioral neurology.Contemporary behavioral neurology has developed foci in common with the neurosciences, but both have evolved noteworthy differences in remit, scope, and clinical emphasis. As a branch of medicine, the former normally requires expertise in the management of the molecular and neurochemical basis of behavioral disorder, the ability to relate functional and structural conditions to clinical data using imaging techniques and electrophysiological methods, the implementation and interpretation of neuropsychological and neuropsychiatric assessments, and comprehensive clinical diagnosis and therapeutic treatment. By contrast, as a branch of science, the latter has crystalized into an academic discipline concerned with epistemological successes about the neural bases of behavior (basic research) and the use of that knowledge in new technologies and developments (applied research). Medicine is a far older profession than science; by implication, behavioral neurology, as a branch of medicine, is a far older field than neuroscience.This history of behavioral neurology divides into six eras: ancient, classical, medieval, post-Renaissance, modern, and contemporary. In some cases, the divisions correspond neatly to major intellectual boundaries, such as the division between ancient and classical periods by Galenism and between modern and contemporary periods by Geschwind's (1965) two-part opus. In others, the boundaries are such that no non-arbitrary division can be established.
AncientAmong the oldest surviving scholarly works in neurosurgery is the so-called 'Edwin Smith Surgical Papyrus' (Breasted, 1930). Now dated to around bce 1600, the papyrus is an amalgam of 48 case descriptions transcribed from a much older treatise that are sometimes conjectured to derive from the time of Imhotep (floruit bce 2645). The first 33 cases describe neck and head injuries; they relate trauma and gross anatomical damage to deficitsdincluding hemiplegia, loss of speech, and seizuresdand prescribe various treatments or palliative measures. The papyrus contains a hieretic lexeme for the term brain, one of humanity's earliest recorded uses. Similar Babylonean surgical texts offer descriptive taxonomies of symptoms now associated with seizures, headaches, meningitis, narcolepsy, cranial nerve injuries, and sundry other con...