Department of Psychology, University of Greifswald, Greifswald, Germany.
Brain Cogn. 2012 Mar;78(2):105-13. doi: 10.1016/j.bandc.2011.12.001. Epub 2011 Dec 27.
Keeping aware of the locations of objects while one is moving requires the updating of spatial representations. As long as the objects are visible, attentional tracking is sufficient, but knowing where objects out of view went in relation to one's own body involves an updating of spatial working memory. Here, multiple object tracking was employed to study spatial updating and its neural correlates. In a dynamic 3D-scene, targets moved among visually indistinguishable distractors. The targets and distractors either stayed visible during continuous viewpoint changes or they turned invisible. The parametric variation of tracking load revealed load-dependent activations of the intraparietal sulcus, the superior parietal lobule, and the lateral occipital cortex in response to the attentive tracking task. Viewpoint changes with invisible objects that demanded retention and updating produced load-dependent activation only in the precuneus in line with its presumed involvement in updating spatial working memory.
在移动过程中保持对物体位置的感知需要更新空间表示。只要物体可见，注意力跟踪就足够了，但要知道看不见的物体相对于自己的身体的位置，就需要更新空间工作记忆。在这里，采用了多目标跟踪来研究空间更新及其神经相关性。在一个动态的 3D 场景中，目标在视觉上无法区分的干扰物之间移动。目标和干扰物要么在连续的视角变化期间保持可见，要么变得不可见。跟踪负载的参数变化揭示了在注意力跟踪任务中，内顶叶沟、上顶叶叶和外侧枕叶皮质对负载的依赖性激活。需要保留和更新的不可见物体的视角变化仅在楔前叶中产生了负载依赖性激活，这与它在更新空间工作记忆中的假定作用一致。
