According to reports from "The Independent", the survey researchers at Tufts University in the US show: when a player got a strong hand or a great chance of winning hand, their arm action is more fluent and confident than other players get a weak hand and no chance of winning cards.
The researchers explained that the player can not only hide their hand strength, but also can make deceptive facial expressions to confuse others. In an other words, the arm leaked harder to hide himself away. The results of a research before show: the player's foot movement is also revealing a key part their hands.
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