Fake smiles can be performed at will, because the brain signals that create them come from the conscious part of the brain and prompt the zygomaticus major muscles in the cheeks to contract.

• 虚假的笑容能够随意制造出来，因为产生它们的大脑信号基于大脑有意识的部分以及促使脸部的颧肌主要肌肉群缩紧。