Hofbauer M, Wuerger S M, Meyer G F, Roehrbein F, Schill K, Zetzsche C
Neurological Clinic, Ludwig Maximilians University, Munich, Germany.
Cogn Affect Behav Neurosci. 2004 Jun;4(2):241-50. doi: 10.3758/cabn.4.2.241.
We investigated the extent to which auditory and visual motion signals are combined when observers are asked to predict the location of a virtually moving target. In Condition 1, the unimodal and bimodal signals were noisy, but the target object was continuously visible and audible; in Condition 2, the virtually moving object was hidden (invisible and inaudible) for a short period prior to its arrival at the target location. Our main finding was that the facilitation due to simultaneous visual and auditory input is very different for the two conditions. When the target is continuously visible and audible (Condition 1), the bimodal performance is twice as good as the unimodal performances, thus suggesting a very effective integration mechanism. On the other hand, if the object is hidden for a short period (Condition 2) and the task therefore requires the extrapolation of motion speed over a temporal and spatial period, the facilitation due to both sensory inputs is almost absent, and the bimodal performance is limited by the visual performance.
我们研究了在要求观察者预测虚拟移动目标位置时，听觉和视觉运动信号的组合程度。在条件1中，单峰和双峰信号都有噪声，但目标物体始终可见且可听；在条件2中，虚拟移动物体在到达目标位置之前的短时间内是隐藏的（不可见且不可听）。我们的主要发现是，两种条件下由于视觉和听觉输入同时存在而产生的促进作用有很大差异。当目标始终可见且可听时（条件1），双峰表现是单峰表现的两倍，因此表明存在一种非常有效的整合机制。另一方面，如果物体在短时间内是隐藏的（条件2），因此任务需要在时间和空间周期内推断运动速度，那么两种感觉输入产生的促进作用几乎不存在，双峰表现受视觉表现的限制。
