a good book on this is Neil Postmanās Amusing Ourselves to Death, in which he argues that television is not neutral because the format of television shows has an adverse effect on the rational capacity of many people, because it is geared either towards unsubstantiated arguments, or simply entertainment. He likens it to the inverse of the transition from smoke signals to the written word, because it allows for a significantly inferior level of discourse. He then analyses how this affects education, religion, families, and various other things: all of these are now viewed by the criterion of entertainment value, thanks to the medium. As McLuhan said, the āmedium is the messageā. There is also Technopoly, which is an analogous thesis, but towards the concept of technology in general, and how it drives culture and intelligence levels. He basically claims that television is the new epistemology (meaning the source of knowledge, rather than the philosophical study of what can be known and how).
its a very tragic thesis, but very true, and even more so know that when it was written 20 years ago. for many people the television is teacher, best friend, idol, hope, world. It both leads to the death of families and has its grip strengthened by the death of families, the modern vicious circle. It reinforces the culture of image, inferiority, promiscuity, akrasia, vanity. Marcel said that materialism verifies its own postulates, meaning - I think - that if we simply live in a materialist fashion we will believe that matter is all there is, and I think that television reinforces atheism by rooting us in the transient. Oh yeah Marcel also said that technology separates man from his inner reality, and he was writing way before TV became popular (Man Against Mass Society).
the televisual culture is obscuring the identity of the people. man is not free, because his chains have become his identity.
so yes, I think the cave is a good analogy for the televisual culture. or the televisual culture is a good analogy for the cave!