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I think you have to assume that at least some of the time that they can. My wife has had LBD for many years. She has not been able to have a regular conversation for about a year. She can show emotion by smiling, laughing or sometimes, crying. Sometimes she will say a series of words that do not make sense. Sometimes she just stares into space and does not respond when spoken to. Once in a while, she responds with a word or phrase that seems appropriate. When people smile at her, she often responds with a smile. There are times of the day when she is more responsive, I guess like all of us. Sometimes old friends call on the phone or visit and I am convinced (or want to believe) that she recognizes their voice. Often she will make noises in response to their voice. I try to be as gentle and kind as possible when I talk with her. I tell her she is beautiful and that I love her. I want to think she understands at some level.
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