Schmiedchen Kristina, Freigang Claudia, Rübsamen Rudolf, Richter Nicole
Faculty of Biosciences, Pharmacy and Psychology, University of Leipzig, Talstr. 33, 04103, Leipzig, Germany,
Atten Percept Psychophys. 2013 Oct;75(7):1507-19. doi: 10.3758/s13414-013-0495-0.
Similarities have been observed in the localization of the final position of moving visual and moving auditory stimuli: Perceived endpoints that are judged to be farther in the direction of motion in both modalities likely reflect extrapolation of the trajectory, mediated by predictive mechanisms at higher cognitive levels. However, actual comparisons of the magnitudes of displacement between visual tasks and auditory tasks using the same experimental setup are rare. As such, the purpose of the present free-field study was to investigate the influences of the spatial location of motion offset, stimulus velocity, and motion direction on the localization of the final positions of moving auditory stimuli (Experiment 1 and 2) and moving visual stimuli (Experiment 3). To assess whether auditory performance is affected by dynamically changing binaural cues that are used for the localization of moving auditory stimuli (interaural time differences for low-frequency sounds and interaural intensity differences for high-frequency sounds), two distinct noise bands were employed in Experiments 1 and 2. In all three experiments, less precise encoding of spatial coordinates in paralateral space resulted in larger forward displacements, but this effect was drowned out by the underestimation of target eccentricity in the extreme periphery. Furthermore, our results revealed clear differences between visual and auditory tasks. Displacements in the visual task were dependent on velocity and the spatial location of the final position, but an additional influence of motion direction was observed in the auditory tasks. Together, these findings indicate that the modality-specific processing of motion parameters affects the extrapolation of the trajectory.
在两种模态中，被判断在运动方向上更远的感知终点可能反映了轨迹的外推，这是由更高认知水平的预测机制介导的。然而，使用相同实验设置对视觉任务和听觉任务之间位移大小进行实际比较的情况很少见。因此，本自由场研究的目的是调查运动偏移的空间位置、刺激速度和运动方向对移动听觉刺激（实验1和2）和移动视觉刺激（实验3）最终位置定位的影响。为了评估听觉表现是否受到用于移动听觉刺激定位的动态变化双耳线索（低频声音的耳间时间差和高频声音的耳间强度差）的影响，实验1和2采用了两个不同的噪声频段。在所有三个实验中，旁侧空间中空间坐标的编码精度较低导致向前位移较大，但这种效应在极端周边被目标偏心率的低估所掩盖。此外，我们的结果揭示了视觉任务和听觉任务之间的明显差异。视觉任务中的位移取决于速度和最终位置的空间位置，但在听觉任务中观察到了运动方向的额外影响。总之，这些发现表明运动参数的模态特异性处理会影响轨迹的外推。
