Opposite perceptual and sensorimotor responses to a size-weight illusion
Opposite perceptual and sensorimotor responses to a size-weight illusion
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DOI：
10.1152/jn.00851.2005
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发表时间：
2006-06-01
影响因子：
2.5
通讯作者：
Westwood, David A.
中科院分区：
文献类型：
--
作者：
Grandy, Mathew S.;Westwood, David A.
感知大小重量错觉（SWI）发生在两个不同大小的相同质量的物体被依次举起时：即使在多次举起尝试之后，较小的物体也始终感觉比较大的物体重。在这里，我们探讨了感觉运动和感知反应之间的关系，以SWI中，较小的两个目标对象的重量实际上略低于（2.7 N）比较大的对象（3.2 N）。对于20个连续的升降机，参与者一致报告说，小重量的物体感觉比大重量的物体更重;然而，同时测量的升降动力学显示出完全相反的模式：峰值握力，峰值握力率，峰值负载力和峰值负载力率都显着大于大重量的物体与小重量的物体。两个物体之间的峰值负荷率的差异是最大的初始升降机，但超过这一点显着下降，这表明感觉运动系统使用的感觉反馈，以纠正最初的过度和低估的对象质量。尽管在早期试验中对提升动力学进行了这些调整，但两个物体的判断重量之间的差异并没有改变。研究结果清楚地表明，感觉运动和知觉系统利用明显不同的机制来确定物体的质量。
The perceptual size-weight illusion (SWI) occurs when two different-sized objects with equal mass are lifted in sequence: the smaller object is consistently reported to feel heavier than the larger object even after repeated lifting attempts. Here we explored the relationship between sensorimotor and perceptual responses to a SWI in which the smaller of the two target objects in fact weighed slightly less (2.7 N) than the larger object (3.2 N). For 20 consecutive lifts, participants consistently reported that the small-light object felt heavier than the large-heavy object; however, concurrently measured lifting dynamics showed exactly the opposite pattern: peak grip force, peak grip force rate, peak load force, and peak load force rate were all significantly greater for the large-heavy object versus the small-light object. The difference in peak load rate between the two objects was greatest for the initial lift but decreased significantly beyond that point, suggesting that the sensorimotor system used sensory feedback to correct for initial over- and underestimations of object mass. Despite these adjustments to lifting dynamics over the early trials, the difference between the judged heaviness of the two objects did not change. The findings clearly demonstrate that the sensorimotor and perceptual systems utilize distinctly different mechanisms for determining object mass.