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  • Title: Neurophysiological correlates of post-hypnotic alexia: a controlled study with Stroop test.
    Author: Casiglia E, Schiff S, Facco E, Gabbana A, Tikhonoff V, Schiavon L, Bascelli A, Avdia M, Tosello MT, Rossi AM, Haxhi Nasto H, Guidotti F, Giacomello M, Amodio P.
    Journal: Am J Clin Hypn; 2010 Jan; 52(3):219-33. PubMed ID: 20187340.
    Abstract:
    To clarify whether hypnotically-induced alexia was able to reduce the Stroop effect due to color/word interference, 12 volunteers (6 with high and 6 with low hypnotizability according to Stanford Hypnotic Susceptibility Scale Form C) underwent a Stroop test consisting of measuring, both in basal conditions and during post-hypnotic alexia, the reaction times (RT) at appearance of a colored word indicating a color. In basal conditions, RT were greater in case of incongruence. In highly hypnotizable participants, the interference was less pronounced during post-hypnotic alexia (-34%, p = 0.03). During alexia, late positive complexamplitude was also greater for congruent than incongruent conditions (p < 0.03), and cardiovascular response to stress was less pronounced as well. In participants showing low hypnotizability, no reduction of Stroop effect was detected during post-hypnotic alexia. Posthypnotic alexia is therefore a real and measurable phenomenon, capable of reducing the color-word interference and the haemodynamic effects of the Stroop test.
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