We typically misestimate the dimensions of our body e.g., we perceive our fingers as shorter, and our torso as more elongated, than they actually are. It stands to reason that those metric biases may also extend to objects that we interact with, to facilitate attunement with the environment. To explore this hypothesis, we compared the metric representations of seven objects and the subjects' own hand using the Line Length Judgment task, in six experiments involving 152 healthy subjects. We evaluated the size estimation errors made for each target (hand or previously observed objects) by asking subjects to compare the vertical or horizontal dimension of a specific target against the length of a vertical or horizontal line. As expected, we showed that the hand is misperceived in its dimensions. Interestingly, we found that metric biases are also present for daily-life objects, such as a mobile phone and a coffee mug, and are not affected by familiarity with the objects. In contrast, objects that are less likely to be manipulated, either because they are potentially harmful or disgusting, were differently represented. Furthermore, the propensity to interact with an object, rated by an independent sample of subjects, best predicted the pattern of metric biases associated with that object. Taken together, these findings support the hypothesis that biases affecting the hand representation extend to objects that elicit action-oriented behavior, highlighting the importance of studying the body as integrated and active in the environment.

我们通常会错误估计身体的尺寸，例如，我们感觉到手指比实际手指短，而躯干则伸长。有理由认为，这些度量偏差也可能扩展到我们与之交互的对象，以促进与环境的协调。为了探索这一假设，我们在6个涉及152名健康受试者的实验中，使用“线长判断”任务比较了7个物体的度量表示和受试者自己的手。通过要求受试者将特定目标的垂直或水平尺寸与垂直或水平线的长度进行比较，我们评估了对每个目标（手或先前观察到的物体）造成的尺寸估计误差。如预期的那样，我们表明手在尺寸上是错误的。有趣的是 我们发现，日常生活中的对象（例如手机和咖啡杯）也存在度量偏差，并且不受对象熟悉程度的影响。相反，以不太可能被操纵的对象（由于它们可能有害或令人作恶）被不同地表示。此外，由对象的独立样本评估与对象互动的倾向，可以最好地预测与该对象关联的度量偏差的模式。综上所述，这些发现支持这样的假设，即影响手部代表的偏见扩展到引发面向动作的行为的对象，从而凸显了研究人体在环境中的整合和活跃的重要性。并且不受对象熟悉程度的影响。相反，以不太可能被操纵的对象（由于它们可能有害或令人作恶）被不同地表示。此外，由对象的独立样本评估与对象互动的倾向，可以最好地预测与该对象关联的度量偏差的模式。综上所述，这些发现支持这样的假设，即影响手部代表的偏见扩展到引发面向动作的行为的对象，从而凸显了研究人体在环境中的整合和活跃的重要性。并且不受对象熟悉程度的影响。相反，以不太可能被操纵的对象（由于它们可能有害或令人作恶）被不同地表示。此外，由对象的独立样本评估与对象互动的倾向，可以最好地预测与该对象关联的度量偏差的模式。综上所述，这些发现支持这样的假设，即影响手部代表的偏见扩展到引发面向动作的行为的对象，从而凸显了研究人体在环境中的整合和活跃的重要性。由独立的受试者样本评估，可以最好地预测与该对象相关的度量偏差的模式。综上所述，这些发现支持这样的假设，即影响手部代表的偏见扩展到引发面向动作的行为的对象，从而凸显了研究人体在环境中的整合和活跃的重要性。由独立的受试者样本评估，可以最好地预测与该对象相关的度量偏差的模式。综上所述，这些发现支持这样的假设，即影响手部代表的偏见扩展到引发面向动作的行为的对象，从而凸显了研究人体在环境中的整合和活跃的重要性。