Shalev R S, Manor O, Amir N, Wertman-Elad R, Gross-Tsur V
Neuropediatric Unit, Shaare Zedek Medical Center, Jerusalem, Israel.
Cortex. 1995 Jun;31(2):357-65. doi: 10.1016/s0010-9452(13)80368-1.
The correlation between arithmetic dysfunction and brain laterality was studied in 25 children with developmental dyscalculia (DD). The children were tested on a standardized arithmetic battery and underwent a neurological and neuro-psychological evaluation. A diagnosis of left hemisphere dysfunction (n = 13) was based on right side soft neurological signs, performance IQ (PIQ) > verbal IQ (VIQ), dyslexia and intact visuo-spatial functions. The criteria for right hemisphere dysfunction (n = 12) were left body signs, VIQ > PIQ, impaired visuo-spatial functions and normal language skills. The groups were similar for age, gender, and socio-economic status. Our results showed that both groups scored more than 2 SD below the mean adjusted score on the arithmetic battery, but the left group was significantly worse in 3 areas: mastery of addition/subtraction, complex multiplication and division and visuo-spatial errors (p < 0.05). The data indicate that dysfunction of either hemisphere hampers arithmetic acquisition, but arithmetic impairment is more profound with left hemisphere dysfunction.
对25名发育性计算障碍（DD）儿童的算术功能障碍与大脑偏侧化之间的相关性进行了研究。这些儿童接受了标准化算术测试，并进行了神经学和神经心理学评估。基于右侧软神经体征、操作智商（PIQ）>言语智商（VIQ）、诵读困难和完整的视觉空间功能，诊断为左半球功能障碍（n = 13）。右半球功能障碍（n = 12）的标准为左侧身体体征、VIQ>PIQ、视觉空间功能受损和语言技能正常。两组在年龄、性别和社会经济地位方面相似。我们的结果显示，两组在算术测试中的得分均比平均调整得分低2个标准差以上，但左半球功能障碍组在三个方面明显更差：加减法掌握、复杂乘除法以及视觉空间错误（p < 0.05）。数据表明，任何一个半球的功能障碍都会妨碍算术能力的获得，但左半球功能障碍导致的算术损伤更为严重。
