jillio
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I will give you prior knowledge. However, as I stated, I have very minimal hearing (not enough to differentiate between "milk" and "beer", at the very least, I only hear sounds) and practically no speech discrimination. So I realistically had no outside factors other than prior knowledge. Now, when it comes to using two words, "milk" and "beer," I've got a 50/50 chance of getting it right. And, in this specific case, getting it right 10 times out of 10 tells me that I was able to pick up on those very "L" and "R" letters each and every time. That can't be disputed. Shel has very valid points about lipreading in a large setting as I know first-hand what that's like, but when you're talking about picking out certain letters -- in this case, the L and R in milk and beer, and especially on a one-on-one basis, there IS a difference. Nothing you say will change that.
But there is a difference. "R" is articulated using the back of the tongue and the soft pallette. "L" is articulated using the tip of the tongue on the bony ridge behind the teeth. Neither are visable in normal conversation. Perhaps in isolation, as you were having someone repeat these words to you, they were overarticulating and slowed their pronunciation down. That does not happen in normal conversation. As I said, these two words, along with many others have been used to test various subjects with various speechreading abilities in a controlled environment that excludes the availablity of all other cues. In these conditions, they are indistinguisable.