Intervalla Lucida
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
Intervalla lucida refers to periods of complete absence of pathological symptoms in patients with certain psychiatric and neurological conditions. In psychiatry, it describes normal mental states between episodes of periodic mental illnesses, particularly in manic-depressive psychosis.
Encyclopedia entry (1928–1936)
INTER VALLA LUCIDA (Latin), light intervals, a term used in psychiatry and neurology to denote the complete absence in a patient for a certain time of pathological phenomena. In psychiatry, it was used to define intervals of normal mental state between episodes of periodically occurring mental diseases; practically, it mostly referred to periods separating the phases of manic-depressive (circular) psychosis. In neurology, such light intervals are observed mainly in disseminated sclerosis (sclerosis disseminata) - the patient for a fairly long time (sometimes several years) feels completely healthy.
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“Intervalla Lucida.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/intervalla-lucida/