Department of General Psychology and Education, Ludwig-Maximilian-University Munich, Munich, Germany.
Department Biology II, Division of Neurobiology, Ludwig-Maximilian-University Munich, Germany.
Q J Exp Psychol (Hove). 2021 Oct;74(10):1784-1790. doi: 10.1177/17470218211009082. Epub 2021 Apr 12.
When a glass is lifted from a tray, there is a challenge for the waiter. He must quickly compensate for the reduction in the weight of the tray to keep it balanced. This compensation is easily achieved if the waiter lifts the glass himself. Because he has, himself, initiated the action, he can predict the timing and the magnitude of the perturbation of the tray and respond (via the holding hand) accordingly. In this study, we examined coordination when either one or two people hold the tray while either one of them or a third person removes the glass. Our results show that there is exquisite coordination between the two people holding the tray. We suggest that this coordination depends upon the haptic link provided by the rigid platform that both people are holding. We conclude that the guest at a reception should not lift his drink from the waiter's tray until they have the waiter's attention but, if too thirsty to wait, should lend a hand holding the tray.
当从托盘上拿起杯子时，服务员会面临一个挑战。他必须迅速补偿托盘重量的减少，以保持平衡。如果服务员自己拿起杯子，这个补偿就很容易实现。因为他自己发起了这个动作，所以他可以预测托盘的扰动时间和幅度，并做出相应的反应（通过握持的手）。在这项研究中，我们研究了当一个或两个人拿着托盘，而一个人或第三个人拿起杯子时的协调情况。我们的研究结果表明，拿着托盘的两个人之间存在着非常协调的关系。我们认为这种协调取决于两个人都握着的刚性平台提供的触觉联系。我们得出结论，在接待会上，客人不应该在得到服务员的注意之前从服务员的托盘上拿起饮料，如果口渴得等不及，可以帮忙扶着托盘。
