Temporal Parameters of Negative Visual Hallucination

Abstract

Abstract Negative visual hallucination was investigated by hypnotically programming two highly trained undergraduates not to see the colored lines of consonants while perceiving clearly a set of dots superimposed on the lines in another color. Effects of three temporal parameters were noted in tachistoscopic presentations of the consonants: priming time, i.e., opportunity for the subject to prepare to execute the negative visual hallucination after the posthypnotic cue was flashed and before the consonant appeared; duration of consonant exposure; and intensive practice over protracted periods of time. Signal strength and inhibitory skill emerged as significant variables.