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首页> 外文期刊>The European Journal of Neuroscience >Vestibular modulation of peripersonal space boundaries
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Vestibular modulation of peripersonal space boundaries

机译：横向调制脉搏空间边界

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摘要

Human-environment interactions are mediated through the body and occur within the peripersonal space (PPS), the space immediately adjacent to and surrounding the body. The PPS is taken to be a critical interface between the body and the environment, and indeed, body-part specific PPS remapping has been shown to depend on body-part utilization, such as upper limb movements in otherwise static observers. How vestibular signals induced by whole-body movement contribute to PPS representation is less well understood. In a series of experiments, we mapped the spatial extension of the PPS around the head while participants were submitted to passive whole-body rotations inducing vestibular stimulation. Forty-six participants, in three experiments, executed a tactile detection reaction time task while task-irrelevant auditory stimuli approached them. The maximal distance at which the auditory stimulus facilitated tactile reaction time was taken as a proxy for the boundary of peri-head space. The present results indicate two distinct vestibular effects. First, vestibular stimulation speeded tactile detection indicating a vestibular facilitation of somatosensory processing. Second, vestibular stimulation modulated audio-tactile interaction of peri-head space in a rotation direction-specific manner. Congruent but not incongruent audio-vestibular motion stimuli expanded the PPS boundary further away from the body as compared to no rotation. These results show that vestibular inputs dynamically update the multisensory delineation of PPS and far space, which may serve to maintain accurate tracking of objects close to the body and to update spatial self-representations.
机译：人环境相互作用通过身体介导并发生在围栏间空间（PPS）内，紧邻身体周围的空间。 PPS被认为是身体和环境之间的关键界面，实际上，已经显示了身体部件特定的PPS重新映射依赖于身体部件利用率，例如静态观察者中的上肢运动。通过全身运动引起的前庭信号有助于PPS表示效果不太清楚。在一系列实验中，我们在头部周围的PPS空间延伸，而参与者被提交给诱导前庭刺激的被动全身旋转。在三次实验中，四十六个参与者执行了触觉检测反应时间任务，而任务无关的听觉刺激接近它们。听觉刺激促进触觉反应时间的最大距离作为Peri头空间边界的代理。目前的结果表明了两个不同的前庭效果。首先，前庭刺激加速触觉检测，表明前瓣加工的前庭促进。其次，前庭刺激以旋转方向特定的方式调制Peri头空间的音频触觉相互作用。同时但不是不一致的音频前庭运动刺激，与没有旋转相比，将PPS边界进一步远离身体。这些结果表明，前庭输入动态更新了PPS和远空间的多句话描绘，这可能用于维持靠近身体的物体并更新空间自我表示的对象。

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