Temporal Parameters of Negative Visual Hallucination

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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.

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