Mikels Joseph A, Reuter-Lorenz Patricia A
Department of Psychology, University of Michigan, Ann Arbor, MI 48109-1109, USA.
Neuropsychology. 2004 Apr;18(2):328-39. doi: 10.1037/0894-4105.18.2.328.
The corpus callosum has been proposed to contribute to attention by modulating resource allocation between the hemispheres and filtering interhemispheric signal transmission (M. T. Banich, 1998). The resource allocation hypothesis predicts that interhemispheric interactions become more advantageous with increasing resource demands. The selective filtering hypothesis predicts that interhemispheric interactions become less advantageous as filtering requirements increase. The authors tested both predictions by comparing within- and across-hemisphere letter matching under dual-task (Experiment 1) and selective attention conditions (Experiment 2). Task-specific resource demands (i.e., letter processing load) alter the bihemispheric advantage, but the general demand imposed by an unrelated secondary task does not. Filtering requirements influenced the advantage from interhemispheric interactions, providing new evidence for the role of the corpus callosum in selective attention.
胼胝体被认为通过调节半球间的资源分配和过滤半球间的信号传输来影响注意力（M.T. Banich，1998）。资源分配假说预测，随着资源需求的增加，半球间的相互作用会变得更具优势。选择性过滤假说预测，随着过滤要求的增加，半球间的相互作用会变得不那么有利。作者通过比较双任务（实验1）和选择性注意条件（实验2）下半球内和半球间的字母匹配来检验这两种预测。特定任务的资源需求（即字母处理负荷）会改变双侧半球优势，但无关次要任务施加的一般需求则不会。过滤要求影响了半球间相互作用的优势，为胼胝体在选择性注意中的作用提供了新证据。
