I’d want to know whether the hallucinations are actually different, or the interpretations of those hallucinations are different. Same data plus different assumptions yields different conclusions, after all. Though if any part of this is like the auditory hallucinations I sometimes get when I’m on the edge of sleep, it’s also going to be affected by what memories are available to build them out of.
If that’s all it is, I think the observation quoted in the headline should have been obvious. Grandpa wasn’t likely to hallucinate the sound of modern telephone ringer, or to interpret it as one if he did experience the equivalent sensation.
