Kluss Thorsten, Schult Niclas, Schill Kerstin, Fahle Manfred, Zetzsche Christoph
Bremen University, Hochschulring 18, Bremen, Germany.
Seeing Perceiving. 2012;25(1):45-69. doi: 10.1163/187847611X620919.
We investigated audiovisual interactions in motion perception by behavioral experiments testing both, the influence of visual stimuli on auditory apparent motion and the influence of auditory stimuli on visual apparent motion perception. A set of loudspeakers with an LED mounted in the middle of each speaker cone was arranged in a semicircle. Apparent motion streams were presented for each modality alone in the unimodal conditions. In the bimodal conditions, stimuli of the second modality were added to fill the temporal and spatial gaps of the sampled trajectory of the reference stream. The participants' task was to observe the quasi-naturalistic stimulus sequences and to perform a standard classification. The addition of stimuli of the second modality indeed facilitated apparent motion perception. Bimodal presentation increased the upper temporal interval up to which the stimuli could be separated in time while still being perceived as continuous motion. We interpret these results as evidence for an ecologically advantageous audiovisual motion integration mechanism which operates beyond the constraints of strict spatiotemporal coincidence. Functional considerations suggest that this mechanism may represent an amodal stage suited for the processing of both unimodal and bimodal signals.
我们通过行为实验研究了运动感知中的视听交互，该实验测试了视觉刺激对听觉表观运动的影响以及听觉刺激对视觉表观运动感知的影响。一组扬声器在每个扬声器锥体的中间安装了一个发光二极管，呈半圆形排列。在单峰条件下，单独为每种模态呈现表观运动流。在双峰条件下，添加第二种模态的刺激以填补参考流采样轨迹的时间和空间间隙。参与者的任务是观察准自然主义的刺激序列并进行标准分类。添加第二种模态的刺激确实促进了表观运动感知。双峰呈现增加了刺激在时间上可以分离但仍被感知为连续运动的上时间间隔。我们将这些结果解释为一种生态上有利的视听运动整合机制的证据，该机制在严格的时空重合的限制之外运作。功能上的考虑表明，这种机制可能代表了一个适用于处理单峰和双峰信号的无模态阶段。
