Maravita Angelo, Bolognini Nadia, Bricolo Emanuela, Marzi Carlo A, Savazzi Silvia
Psychology Department, University of Milano-Bicocca, Milano, Italy.
Neuroreport. 2008 Feb 12;19(3):271-5. doi: 10.1097/WNR.0b013e3282f4f04e.
The brain effectively integrates multisensory information to enhance perception. For example, audiovisual stimuli typically yield faster responses than isolated unimodal ones (redundant signal effect, RSE). Here, we show that the audiovisual RSE is likely subserved by a neural site of integration (neural coactivation), rather than by an independent-channels mechanism such as race models. This neural site is probably the superior colliculus (SC), because an RSE explainable by neural coactivation does not occur with purple or blue stimuli, which are invisible to the SC; such an RSE only occurs for spatially and temporally coincident audiovisual stimuli, in strict adherence with the multisensory responses in the SC of the cat. These data suggest that audiovisual integration in humans occurs very early during sensory processing, in the SC.
大脑有效地整合多感官信息以增强感知。例如，视听刺激通常比孤立的单峰刺激产生更快的反应（冗余信号效应，RSE）。在这里，我们表明视听RSE可能由一个整合神经位点（神经共激活）支持，而不是由诸如竞赛模型之类的独立通道机制支持。这个神经位点可能是上丘（SC），因为对于紫色或蓝色刺激（上丘不可见）不会出现可由神经共激活解释的RSE；这样的RSE仅在空间和时间上重合的视听刺激中出现，严格符合猫上丘中的多感官反应。这些数据表明，人类的视听整合在感觉处理的早期阶段，即在上丘中就会发生。
