 My interest is always piqued whenever there are telepaths and empaths, but...the mention of those strands and people being found by the particular 'flavour' of emotions...that's what evolved when I wrote a character who turned out to be an empath. When merely alive, she was a hypersensitive young woman who started to associate people with colours (a bit like me). After death, this develops into a fuller form of empathy. The colours evolve into auras and eventually, she's able to see strands and use them to amplify or dampen emotions. Another ghost is the empath of the precise kind of knowing the right thing to say or do to get the emotional kick she desires. Both get overloaded by extreme and mass negative emotions (also like me) and both are kind-hearted, which make them very dangerous. It may sound daft, but it feels gratifying to read that a highly-experienced writer also uses the same logic. 