The five-month-old infants were able to discriminate a solid from a similar-looking liquid based on movement cues, or on how the substances poured or tumbled out of upended glasses.

• 基于“运动暗示”理论，以及杯子里的物体是怎样倒出来或者流出来这一线索，五个月大的婴儿就能够把固态物体和类似的液态物体区分开来。