Wave Particle Duality, the Observer and Retrocausality
  We approach wave particle duality, the role of the observer and implications on Retrocausality, by starting with the results of a well verified quantum experiment. We analyze how some current theoretical approaches interpret these results. We then provide an alternative theoretical framework that is consistent with the observations and in many ways simpler than usual attempts to account for retrocausality, involving a non-local conscious Observer. 
Ashok Narasimhan and Menas C. Kafatos
quant-ph