I agree with you Bonnie, I think John Edwards was just basing what he said on his own experiences. (I didn't see the program). I personally think that spirits are able to manifest in different ways to different people. Some people might see something visually, others may get a mental image. Some may hear an actual voice, others may only get the sensation mentally of hearing someone speak. Maybe they sense which form we will most likely be receptive to in order to take notice of them?