The neural basis of ego- and allocentric reference frames in spatial navigation:: Evidence from spatio-temporal coupled current density reconstruction
The neural basis of ego- and allocentric reference frames in spatial navigation:: Evidence from spatio-temporal coupled current density reconstruction
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DOI：
10.1016/j.brainres.2006.08.005
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发表时间：
2006-11-06
期刊：
影响因子：
2.9
通讯作者：
Debus, G.
中科院分区：
文献类型：
--
作者：
Gramann, K.;Mueller, H. J.;Debus, G.
利用脑电源重构技术，研究了不同的空间导航策略在计算机模拟隧道中的应用。隧道由直段和弯曲段组成，仅提供可见血流，但无标志信息。在每个隧道通道结束时，受试者必须指出他们相对于隧道起点的结束位置。尽管所有受试者的视觉信息是相同的，但确定了两个不同的策略组：一组使用自我中心的参考框架，另一组使用非自我中心的参考框架。电流密度重建揭示了在任务的关键阶段使用一个或另一个参考框架与不同的皮层激活模式相关联。对于两个策略组，枕颞网络在最初的直隧道段中占主导地位。然而，随着隧道中的转弯，激活模式开始发散，反映了底层坐标系中的平移和/或旋转变化。自我中心参考框架的计算与后顶叶-前运动网络内的普遍活动有关，额叶区域也有额外的活动。相比之下，计算一个allocentric参考框架与占主导地位的活动在枕-颞网络，确认右颞结构发挥了至关重要的作用，allocentric的空间表示。(c)2006 Elsevier B. V.保留所有权利。
Different strategies in spatial navigation during passages through computer- simulated tunnels were investigated by means of EEG source reconstruction. The tunnels consisted of straight and curved segments and provided only visual flow, but no landmark, information. At the end of each tunnel passage, subjects had to indicate their end position relative to the starting point of the tunnel. Even though the visual information was identical for all subjects, two different strategy groups were identified: one group using an egocentric and the other group an allocentric reference frame. The current density reconstruction revealed the use of one or the other reference frame to be associated with distinct cortical activation patterns during critical stages of the task. For both strategy groups, an occipito -temporal network was dominantly active during the initial, straight tunnel segment. With turns in the tunnel, however, the activation patterns started to diverge, reflecting translational and/or rotational changes in the underlying coordinate systems. Computation of an egocentric reference frame was associated with prevailing activity within a posterior parietal-premotor network, with additional activity in frontal areas. In contrast, computation of an allocentric reference frame was associated with dominant activity within an occipito -temporal network, confirming right-temporal structures to play a crucial role for an allocentric representation of space. (c) 2006 Elsevier B.V. All rights reserved.