Takayama Y, Sugishita M, Akiguchi I, Kimura J
Department of Rehabilitation, Tokyo Metropolitan Institute for Neuroscience, Japan.
Arch Neurol. 1994 Mar;51(3):286-91. doi: 10.1001/archneur.1994.00540150084021.
To clarify the characteristics and the localization of isolated calculation disturbances due to left parietal lesions.
Case series.
Tertiary care hospital.
Three referred patients with isolated calculation disturbances due to stroke in the left parietal region. Sixteen volunteers for age and education constituted the control group.
Neuropsychological tests, including a battery of tests for acalculia and the Wechsler Adult Intelligence Scale, and magnetic resonance imaging were performed.
Three patients made calculation errors in the process where a number of steps were carried out simultaneously. The patients showed no aphasic components in number operations. They understood the basic processes of calculation. They showed little difficulty in the retrieval of table values. The patients had no impairment in aligning arithmetic problems or in assigning and maintaining place-holding values. They did not show any deficit of immediate memory for calculation problems. Overlapping lesions were located along the left intraparietal sulcus.
The area lying along the left intraparietal sulcus is critical for isolated parietal acalculia. The profile of isolated acalculia suggests that it results from the disruption of the working memory for calculation.
明确因左侧顶叶病变导致的孤立性计算障碍的特征及定位。
病例系列。
三级医疗中心。
3例因左侧顶叶区域中风导致孤立性计算障碍的转诊患者。16名年龄和受教育程度匹配的志愿者组成对照组。
进行神经心理学测试，包括一系列失算症测试和韦氏成人智力量表测试，以及磁共振成像检查。
3例患者在同时进行多个步骤的计算过程中出现计算错误。患者在数字运算中无失语成分。他们理解基本的计算过程。他们在检索表格值方面几乎没有困难。患者在排列算术问题或分配和保持占位值方面没有障碍。他们在计算问题的即时记忆方面没有任何缺陷。重叠性病变位于左侧顶内沟沿线。
左侧顶内沟沿线区域对孤立性顶叶失算症至关重要。孤立性失算症的表现提示其是由计算工作记忆的破坏所致。
