Effects of Hand and Hemispace on Multisensory Integration of Hand Position and Visual Feedback
Effects of Hand and Hemispace on Multisensory Integration of Hand Position and Visual Feedback
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DOI：
10.3389/fpsyg.2019.00237
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发表时间：
2019-02-12
影响因子：
3.8
通讯作者：
Heuer, Herbert
中科院分区：
文献类型：
--
作者：
Rand, Miya K.;Heuer, Herbert
大脑通常会整合多种感觉信号以形成统一的感知。即使在光标控制任务中，例如在观察显示器上旋转的视觉反馈时进行触及，光标位置的视觉信息和手位置的本体感觉信息也是部分集成的（感觉耦合），导致光标和手的感知位置相互偏差。先前的研究表明，感觉耦合的强度（相互偏差的总和）取决于手部运动和光标运动之间的运动学相关性的经验，而感觉耦合的不对称性（偏差之间的差异）取决于手部位置和光标位置估计的相对可靠性（变异性的倒数）（可靠性规则）。此外，众所周知，运动控制的精度和手部位置的感知在手（左、右）和工作空间（同侧、对侧）之间存在差异，日常生活活动中运动学相关性的体验也是如此。因此，在本研究中，我们测试了光标控制任务中触及终点的感觉耦合的强度和不对称性在右手和左手之间以及同侧和对侧半空间之间是否不同。手之间或半空间之间的感觉耦合强度没有发现差异。然而，同侧半空间的感觉耦合不对称性小于对侧半空间：在同侧半空间，感知的手位置的偏差减少，伴随着估计的较小变异性。优势右手位置估计的变异性也小于非优势左手，但这种差异并不伴随感觉耦合不对称性的差异——这违反了可靠性规则，可能是由于视觉信息对右手运动的影响更大。根据这些结果，手部运动和光标运动之间所经历的运动学相关性对感觉耦合强度的长期影响是通用的，而不是特定于半空间或手的，而相对可靠性对感觉耦合不对称性的影响是特定于半空间的，而不是特定于手的。
The brain generally integrates a multitude of sensory signals to form a unified percept. Even in cursor control tasks, such as reaching while looking at rotated visual feedback on a monitor, visual information on cursor position and proprioceptive information on hand position are partially integrated (sensory coupling), resulting in mutual biases of the perceived positions of cursor and hand. Previous studies showed that the strength of sensory coupling (sum of the mutual biases) depends on the experience of kinematic correlations between hand movements and cursor motions, whereas the asymmetry of sensory coupling (difference between the biases) depends on the relative reliabilities (inverse of variability) of hand-position and cursor-position estimates (reliability rule). Furthermore, the precision of movement control and perception of hand position are known to differ between hands (left, right) and workspaces (ipsilateral, contralateral), and so does the experience of kinematic correlations from daily life activities. Thus, in the present study, we tested whether strength and asymmetry of sensory coupling for the endpoints of reaches in a cursor control task differ between the right and left hand and between ipsilateral and contralateral hemispace. No differences were found in the strength of sensory coupling between hands or between hemispaces. However, asymmetry of sensory coupling was less in ipsilateral than in contralateral hemispace: in ipsilateral hemispace, the bias of the perceived hand position was reduced, which was accompanied by a smaller variability of the estimates. The variability of position estimates of the dominant right hand was also less than for the non-dominant left hand, but this difference was not accompanied by a difference in the asymmetry of sensory coupling - a violation of the reliability rule, probably due a stronger influence of visual information on right-hand movements. According to these results, the long-term effects of the experienced kinematic correlation between hand movements and cursor motions on the strength of sensory coupling are generic and not specific for hemispaces or hands, whereas the effects of relative reliabilities on the asymmetry of sensory coupling are specific for hemispaces but not for hands.