Receptive field: refers to the range that a person can feel for various stimuli, that is, the stimulated area in the sensory system that can cause a certain nerve cell or nerve fiber response. According to the above definitions, what does the following do not involve receptive fields? ['Blind people have different characteristics in touch than those with normal vision.', 'Xiao Zhang feels that I am coming today, and after a while, I come.', 'In the depths of the ocean, some large fish can make a variety of human-inaudible sounds.', 'Xiaoli works in a tannery, and he can distinguish between artificial leather and genuine leather with his hand.']