Cold and heavy: grasping the temperature–weight illusion
Cold and heavy: grasping the temperature–weight illusion
复制标题
冷而重：把握温度-重量错觉
DOI：
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发表时间：
2020
影响因子：
2
通讯作者：
Johanna Hagenkamp
中科院分区：
文献类型：
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作者：
J. Kuhtz;Johanna Hagenkamp
放在皮肤上的重物的明显重量取决于它们的温度。我们研究了这样的温度-重量错觉（TWI）的知觉和行动的21名健康志愿者的影响。将冷（18 °C）、热中性（32 °C，皮肤温度）和热（41 °C）测试对象放置在非惯用手的手掌上。它们的实际质量为350 g（轻）或700 g（重）。感知的沉重感进行了评估，两个心理物理实验（幅度估计，交叉模式匹配）。冷重物体比相同质量、形状和材料的热中性物体重20%。在随后的抓握-举起实验中，用优势手的精确抓握来抓握测试对象，并将其从非优势手的手掌上举起。记录指尖施加的抓握力和上提力。物体的温度对峰值抓握力和提升力以及峰值抓握力速率具有显著影响（ANOVA，p < 0.05）（即，初始力倾斜）。与其他相同的热中性物体相比，当抓住并举起冷的重物时，峰值握力高出约10%。TWI是不太明显时，轻的物体或温暖的物体进行处理。总之，物体的冷却增加了其明显的重量（感知），并影响抓握和提升（动作）过程中指尖力的缩放。
The apparent heaviness of weights placed on the skin depends on their temperature. We studied the effects of such a temperature–weight illusion (TWI) on perception and action in 21 healthy volunteers. Cold (18 °C), thermal-neutral (32 °C, skin temperature) and warm (41 °C) test objects were placed onto the palm of the non-dominant hand. Their veridical mass was 350 g (light) or 700 g (heavy). Perception of heaviness was assessed with two psychophysical experiments (magnitude estimation, cross modal matching). Cold heavy objects felt about 20% heavier than thermal-neutral objects of the same mass, shape and material. In a subsequent grip-lift experiment, the test objects were grasped with a precision grip of the dominant hand and lifted off the palm of the non-dominant hand. The grip and lift forces exerted by the fingertips were recorded. The temperature of the objects had significant effects (ANOVA, p < 0.05) on the peak grip and lift forces and on the peak grip force rate (i.e., the initial force incline). The peak grip force was about 10% higher when cold heavy objects were grasped and lifted, compared to lifts of otherwise identical thermal-neutral objects. The TWI was less pronounced when light objects or warm objects were handled. In conclusion, cooling of an object increases its apparent heaviness (perception) and influences scaling of the fingertip forces during grasping and lifting (action).