Yazgan M Y, Wexler B E, Kinsbourne M, Peterson B, Leckman J F
Child Study Center, Yale University School of Medicine, New Haven, Connecticut, USA.
Neuropsychologia. 1995 Jun;33(6):769-79. doi: 10.1016/0028-3932(95)00018-x.
We considered the hypothesis that the richness of callosal interhemispheric connections has a role in determining the degree of behavioural laterality and time-sharing ability in dual-task performance. Behavioural laterality as measured by dichotic word listening, line bisection and turning bias tests correlated inversely with the midsagittal cross-sectional area of the corpus callosum, as seen on MRI. The amount of dual task interference was strongly inversely correlated with the callosal area in both within-hemisphere and between-hemispheres conditions. These relationships between normal variations in callosal area, and outcomes on tests both of laterally and time-sharing capacity in normal adults suggest that the corpus callosum assumes a cross-excitatory role when subjects perform these tasks.
我们考虑了这样一种假设，即胼胝体半球间连接的丰富程度在决定双任务表现中的行为偏侧性程度和时间共享能力方面发挥作用。通过双耳分听、直线二等分和转向偏差测试所测量的行为偏侧性，与MRI上所见的胼胝体矢状面横截面积呈负相关。在半球内和半球间条件下，双任务干扰量与胼胝体面积均呈强烈负相关。胼胝体面积的正常变化与正常成年人的偏侧性测试结果和时间共享能力测试结果之间的这些关系表明，当受试者执行这些任务时，胼胝体发挥交叉兴奋性作用。
