> Close Encounters of the Fourth kind[edit]
A UFO event in which a human is abducted by a UFO or its occupants.[14] This type was not included in Hynek's original close encounters scale.[15]
Hynek's erstwhile associate Jacques Vallee argued in the Journal of Scientific Exploration that a CE4 should be described as "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.