translation.en: describing the fine texture of the surface of this object, so the animal can judge what is the correct object that he has to grab, and if he does that, he gets a reward without moving a muscle.
translation.zh: 给这个动物描述物体表面的质地 猴子就能够判断它需要选哪个物体 如果它找到正确的物体， 他将无需动一块肌肉而得到奖赏