Glasauer Stefan, Stein Alexandra, Günther Anna L, Flanagin Virginia L, Jahn Klaus, Brandt Thomas
Institute of Clinical Neurosciences, Ludwig-Maximilians University, Munich, Germany.
Ann N Y Acad Sci. 2009 May;1164:201-5. doi: 10.1111/j.1749-6632.2009.03862.x.
Without landmarks, navigation is based on information about self-velocity, which is transformed to position or orientation by a process called path integration. Simple path integration tasks, such as reaching a previously seen goal by blindfolded locomotion, were often considered to be automatic and not influenced by unrelated cognitive activity. However, we recently showed that reproduction of self-motion without landmark cues exhibits systematic dual-task interference. Since these experiments did not exclude that the dual task only interferes with memory for self-motion, we performed two additional experiments testing generic path integration. We show that locomotor homing and reaching predefined goals by active self-motion are affected systematically by a concurrent mental task. The similarity of the effects we found to those reported for duration estimation led us to the hypothesis that subjective time may be used as a temporal basis of path integration. Alternatively, path integration and duration estimation may be based on similar underlying neuronal mechanisms, for example, coincidence detection in neural oscillators.
在没有地标线索的情况下，导航是基于自身速度信息的，通过一种称为路径积分的过程将其转换为位置或方向。简单的路径积分任务，比如蒙眼移动到先前看到的目标，通常被认为是自动的，不受无关认知活动的影响。然而，我们最近发现，在没有地标线索的情况下再现自我运动表现出系统性的双任务干扰。由于这些实验没有排除双任务仅干扰自我运动记忆的可能性，我们又进行了另外两个测试一般路径积分的实验。我们发现，同时进行的心理任务会系统性地影响运动归巢以及通过主动自我运动到达预定义目标。我们发现的这些效应与时长估计中所报告的效应相似，这使我们提出一个假设，即主观时间可能被用作路径积分的时间基础。或者，路径积分和时长估计可能基于相似的潜在神经机制，例如神经振荡器中的巧合检测。
