Gloor P, Ball G, Schaul N
Neurology. 1977 Apr;27(4):326-33. doi: 10.1212/wnl.27.4.326.
Localized delta activity appears in cortex overlying a circumscribed white matter lesion. Less commonly, localized delta activity may result from a localized thalamic lesion. Unilateral diffuse delta activity appears on the side of thalamic or hypothalamic lesions. Bilateral delta activity results from bilateral lesions of the midbrain tegmentum. Localized lesions of the cerebral cortex, unilateral mesencephalic tegmental lesions, and vasogenic edema of the cerebral white matter do not produce delta activity. Marked edema of a cerebral hemisphere when no surgical decompression is provided may produce unilateral delta activity by pressure on or displacement of the brain stem or diencephalon.
局限性δ活动出现在局限性白质病变上方的皮质中。较少见的情况下，局限性δ活动可能由局限性丘脑病变引起。单侧弥漫性δ活动出现在丘脑或下丘脑病变侧。双侧δ活动由中脑被盖的双侧病变引起。大脑皮质的局限性病变、单侧中脑被盖病变以及脑白质的血管源性水肿不会产生δ活动。当未进行手术减压时，大脑半球的明显水肿可能通过压迫或移位脑干或间脑而产生单侧δ活动。
