Siegle Joshua H, Campos Jennifer L, Mohler Betty J, Loomis Jack M, Bülthoff Heinrich H
Department of Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Tübingen, Germany.
Exp Brain Res. 2009 May;195(3):429-44. doi: 10.1007/s00221-009-1805-6. Epub 2009 Apr 26.
In order to optimally characterize full-body self-motion perception during passive translations, changes in perceived location, velocity, and acceleration must be quantified in real time and with high spatial resolution. Past methods have failed to effectively measure these critical variables. Here, we introduce continuous pointing as a novel method with several advantages over previous methods. Participants point continuously to the mentally updated location of a previously viewed target during passive, full-body movement. High-precision motion-capture data of arm angle provide a measure of a participant's perceived location and, in turn, perceived velocity at every moment during a motion trajectory. In two experiments, linear movements were presented in the absence of vision by passively translating participants with a robotic wheelchair or an anthropomorphic robotic arm (MPI Motion Simulator). The movement profiles included constant-velocity trajectories, two successive movement intervals separated by a brief pause, and reversed-motion trajectories. Results indicate a steady decay in perceived velocity during constant-velocity travel and an attenuated response to mid-trial accelerations.
为了最佳地表征被动平移过程中的全身自我运动感知，必须实时且以高空间分辨率量化感知位置、速度和加速度的变化。过去的方法未能有效测量这些关键变量。在此，我们引入连续指向作为一种新方法，它比以前的方法具有多个优势。参与者在被动全身运动期间持续指向先前看到的目标在脑海中更新后的位置。手臂角度的高精度运动捕捉数据提供了参与者感知位置的度量，进而提供了运动轨迹中每个时刻的感知速度。在两个实验中，通过使用机器人轮椅或拟人机器人手臂（MPI运动模拟器）被动平移参与者，在无视觉的情况下呈现线性运动。运动轮廓包括匀速轨迹、由短暂停顿分隔的两个连续运动间隔以及反向运动轨迹。结果表明，在匀速行进期间感知速度稳步下降，并且对试验中期加速度的反应减弱。
