A Close Encounter of the fourth kind is a close encounter of a UFO event in which a human is abducted by a UFO or its occupants.[1] This type was not included in Hynek's original close encounters scale.[2]

Hynek's erstwhile associate Jacques Vallee argued in the Journal of Scientific Exploration that the "Fourth Kind" should refer to "cases when witnesses experienced a transformation of their sense of reality", so as to also include non-abduction cases where absurd, hallucinatory or dreamlike events are associated with UFO encounters.[3]

List of abduction casesEdit



  1. What're close encounters of the first, second, third, fourth and fifth kind?. S.P.S. Jain. The Times of India. 22 March 2003. Retrieved 4 April 2014.
  2. The UFO Experience: A Scientific Enquiry. 1972. ISBN 978-1-56924-782-2. 
  3. Vallee, Jacques. "Physical Analysis in Ten Cases of Unexplained Aerial Objects with Material Samples Template:Webarchive." 1998. Journal of Scientific Exploration. Vol. 12, No. 3., pp. 359-375. URL accessed 23 August 2009


  • Informania: Aliens, page 19
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