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Hypnotic color blindness and performance on the Stroop test.

D Mallard¹, R A Bryant

¹University of New South Wales, Sydney, Australia.

The International Journal of Clinical and Experimental Hypnosis

|October 13, 2001

Summary

Hypnotic color blindness slows shape naming when color-name associations conflict. High hypnotizability participants showed slower responses to incongruent stimuli, suggesting cognitive mediation of hypnotic suggestions.

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Area of Science:

Cognitive Psychology
Neuroscience
Hypnosis Research

Background:

Hypnotic suggestions can alter perception, but the underlying mechanisms are debated.
Investigating hypnotic color blindness offers insight into how suggestions impact visual processing and cognitive control.

Purpose of the Study:

To investigate the cognitive effects of hypnotic color blindness using a reverse Stroop task.
To examine response patterns in high hypnotizable individuals following a color blindness suggestion.

Main Methods:

Administered a reverse Stroop color-naming task to 18 high hypnotizable participants after a hypnotic color blindness suggestion.
Participants learned color-shape associations and then named shapes presented in congruent or incongruent colors.

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Main Results:

Participants were slower to name shapes with color names incongruent with their printed color.
Naming "unseen" shapes was slower than "seen" shapes.
Color-incongruent shapes, when printed in the suggested "color-blind" color, elicited slower naming times.

Conclusions:

The findings support the role of cognitive mechanisms in mediating hypnotic color blindness.
Response patterns suggest that hypnotic suggestions can influence attentional and perceptual processes.