Zacks J, Rypma B, Gabrieli J D, Tversky B, Glover G H
Department of Psychology, Stanford University, CA 94305, USA.
Neuropsychologia. 1999 Aug;37(9):1029-40. doi: 10.1016/s0028-3932(99)00012-3.
A number of spatial reasoning problems can be solved by performing an imagined transformation of one's egocentric perspective. A series of experiments were carried out to characterize this process behaviorally and in terms of its brain basis, using functional magnetic resonance imaging (tMRI). In a task contrast designed to isolate egocentric perspective transformations, participants were slower to make left-right judgments about a human figure from the figure's perspective than from their own. This transformation led to increased cortical activity around the left parietal-temporal-occipital junction, as well as in other areas including left frontal cortex. In a second task contrast comparing judgments about inverted figures to judgments about upright figures (always from the figure's perspective), participants were slower to make left-right judgments about inverted figures than upright ones. This transformation led to activation in posterior areas near those active in the first experiment, but weaker in the left hemisphere and stronger in the right, and also to substantial left frontal activation. Together, the data support the specialization of areas near the parietal-temporal-occipital junction for egocentric perspective transformations. These results are also suggestive of a dissociation between egocentric perspective transformations and object-based spatial transformations such as mental rotation.
一些空间推理问题可以通过对自身中心视角进行想象中的转换来解决。利用功能磁共振成像（tMRI）进行了一系列实验，从行为和大脑基础方面对这一过程进行表征。在一个旨在分离自身中心视角转换的任务对比中，参与者从人物自身视角对人物进行左右判断比从自己的视角做出判断要慢。这种转换导致左顶叶 - 颞叶 - 枕叶交界处以及包括左额叶皮层在内的其他区域的皮质活动增加。在第二个任务对比中，将对倒置图形的判断与对直立图形的判断（始终从图形自身视角）进行比较，参与者对倒置图形进行左右判断比直立图形要慢。这种转换导致在第一个实验中活跃区域附近的后部区域激活，但在左半球较弱而在右半球较强，并且还导致大量的左额叶激活。总体而言，数据支持顶叶 - 颞叶 - 枕叶交界处附近区域在自身中心视角转换方面的专门化。这些结果也暗示了自身中心视角转换与基于物体的空间转换（如心理旋转）之间的分离。
