A common perceptual temporal limit of binding synchronous inputs across different sensory attributes and modalities
A common perceptual temporal limit of binding synchronous inputs across different sensory attributes and modalities
复制标题
DOI：
10.1098/rspb.2010.0243
复制
发表时间：
2010-08-07
影响因子：
4.7
通讯作者：
Nishida, Shin'ya
中科院分区：
文献类型：
--
作者：
Fujisaki, Waka;Nishida, Shin'ya
人脑通过多个感觉通道处理周围环境的不同方面，每个通道可以细分为多个属性特定的通道。当大脑通过不同的渠道重新绑定感觉内容信息(“什么”)时，时间上的重合(“何时”)和空间上的重合(“哪里”)提供了关键线索。然而，目前尚不清楚绑定同步属性的神经机制是每种属性组合特有的，还是普遍的和中心的。在人类心理物理实验中，我们考察了视觉、听觉和触觉属性的组合如何影响基于同步的绑定的时间频率限制。结果表明，属性间捆绑的上限低于属性内捆绑的上限，视觉、听觉和触觉属性的任意组合(2-3赫兹)的上限惊人地相似。它们不太可能是判断同步性的界限，因为跨属性同步性判断的时间界限较高，并且随通道组合(4-9赫兹)而变化。这些发现表明，跨属性时间捆绑是由一个缓慢的中央过程调节的，该过程结合了单独处理的单个事件的“什么”和“何时”属性。同步性能反映了‘When’处理中存在的时间瓶颈，而绑定性能反映了集成‘When’和‘What’属性的中心时间限制。
The human brain processes different aspects of the surrounding environment through multiple sensory modalities, and each modality can be subdivided into multiple attribute-specific channels. When the brain rebinds sensory content information ('what') across different channels, temporal coincidence ('when') along with spatial coincidence ('where') provides a critical clue. It however remains unknown whether neural mechanisms for binding synchronous attributes are specific to each attribute combination, or universal and central. In human psychophysical experiments, we examined how combinations of visual, auditory and tactile attributes affect the temporal frequency limit of synchrony-based binding. The results indicated that the upper limits of cross-attribute binding were lower than those of within-attribute binding, and surprisingly similar for any combination of visual, auditory and tactile attributes (2-3 Hz). They are unlikely to be the limits for judging synchrony, since the temporal limit of a cross-attribute synchrony judgement was higher and varied with the modality combination (4-9 Hz). These findings suggest that cross-attribute temporal binding is mediated by a slow central process that combines separately processed 'what' and 'when' properties of a single event. While the synchrony performance reflects temporal bottlenecks existing in 'when' processing, the binding performance reflects the central temporal limit of integrating 'when' and 'what' properties.