Neurotology Unit, Department of Brain Sciences, Imperial College London, London, UK; Universidad del Desarrollo, Escuela de Fonoaudiología, Facultad de Medicina Clínica Alemana, Santiago, Chile; Department of Clinical and Movement Neurosciences, Centre for Vestibular and Behavioural Neurosciences, University College London, London, UK.
Neurotology Unit, Department of Brain Sciences, Imperial College London, London, UK.
Neurosci Lett. 2022 Apr 1;775:136548. doi: 10.1016/j.neulet.2022.136548. Epub 2022 Feb 25.
To orientate in space, the brain must integrate sensory information that encodes the position of the body with the visual cues from the surrounding environment. In this process, the extent of reliance on visual information is known as the visual dependence. Here, we asked whether the relative positions of the head and body can modulate such visual dependence (VD). We used the effect of optokinetic stimulation (30°/s) on subjective visual vertical (SVV) to quantify VD as the average optokinetic-induced SVV bias in clockwise and counter-clockwise directions. The VD bias was measured in eight subjects with a head-on-body tilt (HBT) where only the head was tilted on the body, and also with a whole-body tilt (WBT) where the head and body were tilted together. The VD bias with HBT of 20° was in the same direction of the head tilt position (left tilt VD -1.35 ± 0.1.2°; right VD 1.60 ± 0.9°), whereas the VD bias with WBT of 20° was in a direction away from the body tilt position (left tilt VD 2.5 ± 1.1°; right tilt VD -2.1 ± 0.9°). These findings show differential effects of relative head and body positions on visual cue integration, a process which could facilitate optimal interaction with the surrounding environment for spatial orientation.
为了在空间中定位，大脑必须整合身体位置的感觉信息和周围环境的视觉线索。在这个过程中，对视觉信息的依赖程度被称为视觉依赖（VD）。在这里，我们研究了头部和身体的相对位置是否可以调节这种视觉依赖。我们使用视动刺激（30°/s）对主观垂直视觉（SVV）的影响来量化 VD，即顺时针和逆时针方向的平均视动诱导 SVV 偏差。在头部与身体成一定角度倾斜（HBT）的情况下，我们测量了 8 名被试的 VD 偏差，其中只有头部在身体上倾斜，而在头部和身体一起倾斜的情况下（WBT），我们也测量了 VD 偏差。HBT 为 20°时，VD 偏差与头部倾斜位置相同（左侧倾斜 VD -1.35±0.1.2°；右侧 VD 1.60±0.9°），而 WBT 为 20°时，VD 偏差与身体倾斜位置相反（左侧倾斜 VD 2.5±1.1°；右侧倾斜 VD -2.1±0.9°）。这些发现表明，头部和身体相对位置对视觉线索整合有不同的影响，这一过程有助于大脑与周围环境进行最佳的空间定向交互。
