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Neurophysiological correlates of post-hypnotic alexia: a controlled study with Stroop test.

Edoardo Casiglia1, Sami Schiff, Enrico Facco

  • 1Department of Clinical and Experimental Medicine, University of Padova, Via Giustiniani, 2, I-35128 Padova, Italy. edoardo.casiglia@unipd.it

The American Journal of Clinical Hypnosis
|March 2, 2010
PubMed
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Hypnotically-induced alexia reduced the Stroop effect, a measure of color-word interference, in highly hypnotizable individuals. This phenomenon also lessened cardiovascular stress responses during the test.

Area of Science:

  • Cognitive Psychology
  • Neuroscience

Background:

  • The Stroop effect demonstrates cognitive interference between word meaning and color perception.
  • Hypnotizability varies among individuals, potentially influencing cognitive responses to suggestion.

Purpose of the Study:

  • To investigate if hypnotically-induced alexia can mitigate the Stroop effect.
  • To assess the impact of post-hypnotic alexia on cognitive interference and physiological responses.

Main Methods:

  • 12 volunteers (6 high, 6 low hypnotizability) performed a Stroop test under basal and post-hypnotic alexia conditions.
  • Reaction times (RT) and cardiovascular responses were measured.
  • Stanford Hypnotic Susceptibility Scale Form C was used for assessment.

Main Results:

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  • In highly hypnotizable participants, post-hypnotic alexia significantly reduced Stroop interference (-34%, p=0.03).
  • Alexia also led to increased late positive complex amplitude and reduced cardiovascular stress.
  • Low hypnotizability participants showed no reduction in the Stroop effect during alexia.

Conclusions:

  • Post-hypnotic alexia is a measurable phenomenon that can decrease color-word interference.
  • Hypnotically-induced alexia impacts cognitive processing and physiological stress responses, particularly in highly hypnotizable individuals.