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When people speak, do you listen? How much of what's communicated do you internalize?

Recently, I was talking to someone who was not very present in the conversation. Even though she would nod and say "Yeah" the whole time we communicated, her follow-up comments would reveal she wasn't listening 100%.

For example, there was a point when I talking about A, but she kept replying to me as if I was saying B.
I thought it was really strange, so I repeated what I said in a slower, more precise manner. But the same thing happened - while she would nod and say "Yeah" while I was speaking, her reply suggested she did not get the gist of what I was trying to say...