Can you elaborate on what you mean by appearance in the first sentence? Also cognition. Is this the same as understanding or is thinking a better synonym? Can

Can you elaborate on what you mean by appearance in the first sentence? Also cognition. Is this the same as understanding or is thinking a better synonym? Can you think of any examples from before say 2010 where there would be any reason for a human to wonder whether another party engaged in a coherent conversation has any reason to assume they were not engaged with another hunan?