Multisensory integration in the estimation of walked distances
Multisensory integration in the estimation of walked distances
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DOI：
10.1007/s00221-012-3048-1
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发表时间：
2012-05-01
影响因子：
2
通讯作者：
Buelthoff, Heinrich H.
中科院分区：
文献类型：
--
作者：
Campos, Jennifer L.;Butler, John S.;Buelthoff, Heinrich H.
当在太空中行走时，动态视觉信息（光流）和基于身体的信息（本体感受和前庭）共同指定了行进距离的大小。虽然最近的证据已经证明了这些线索中的每一个都可以独立使用的程度，但关于它们同时存在时如何整合的了解较少。许多研究表明，感官信息是使用加权线性和集成，但很少有人知道这是否适用于整合的视觉和身体为基础的线索的距离感知。在这项使用虚拟现实技术的研究中，参与者首先行进了预定义的距离，然后通过调整以自我为中心的深度目标来匹配该距离。视觉刺激包括一条长长的走廊，并通过头戴式显示器立体呈现。基于身体的线索提供步行在一个完全跟踪自由行走空间（实验。1)或者被动地坐在轮椅上移动（Exp. 2）。旅行的距离提供通过光流单独，单独的身体为基础的线索或通过两种线索相结合。在组合条件下，视觉指定的距离是一致的（1.0倍）或不一致的（0.7倍或1.4倍）与身体为基础的线索指定的距离。反应反映了视觉和基于身体的信息的一致的综合效果，具有整体较高的影响力的基于身体的线索时，步行和视觉线索在被动运动的影响力较高。当比较实验1和2的结果时，很明显，本体感受和前庭线索都有助于步行过程中的行进距离估计。这些观察到的结果有效地描述了使用基本的线性加权模型。
When walking through space, both dynamic visual information (optic flow) and body-based information (proprioceptive and vestibular) jointly specify the magnitude of distance travelled. While recent evidence has demonstrated the extent to which each of these cues can be used independently, less is known about how they are integrated when simultaneously present. Many studies have shown that sensory information is integrated using a weighted linear sum, yet little is known about whether this holds true for the integration of visual and body-based cues for travelled distance perception. In this study using Virtual Reality technologies, participants first travelled a predefined distance and subsequently matched this distance by adjusting an egocentric, in-depth target. The visual stimulus consisted of a long hallway and was presented in stereo via a head-mounted display. Body-based cues were provided either by walking in a fully tracked free-walking space (Exp. 1) or by being passively moved in a wheelchair (Exp. 2). Travelled distances were provided either through optic flow alone, body-based cues alone or through both cues combined. In the combined condition, visually specified distances were either congruent (1.0x) or incongruent (0.7x or 1.4x) with distances specified by body-based cues. Responses reflect a consistent combined effect of both visual and body-based information, with an overall higher influence of body-based cues when walking and a higher influence of visual cues during passive movement. When comparing the results of Experiments 1 and 2, it is clear that both proprioceptive and vestibular cues contribute to travelled distance estimates during walking. These observed results were effectively described using a basic linear weighting model.