<prompt> Preception of object without external stimulus called ?DelusionSuperstitionIllusionHallucination  <response>: Hallucination -False perception which occurs in the absence of any real object stimulus. Hallucination are as vivid as a real preception . vivid - detailed clarity Superstition - a false belief which is unexplained by reality and is shared by a number of people. Delusions - disorder of content of thoughts which is firm ,false , unshakabledespite continuous evidence against it and is not explained by socio cultural background of patient. 