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Related Experiment Video

Updated: Oct 5, 2025

Training Synesthetic Letter-color Associations by Reading in Color

Training Synesthetic Letter-color Associations by Reading in Color

Published on: February 20, 2014

Negative Color Aftereffect in the Absence of a Colored Stimulus.

Oksana Sivkovich Fagin¹, Arien Mack¹

¹Department of Psychology, 5926The New School for Social Research, New York, NY, USA.

|January 31, 2022

Summary

This summary is machine-generated.

Negative color aftereffects can occur without sensory adaptation. Highly suggestible individuals hallucinating color experienced these effects, demonstrating that sensory adaptation is not essential for negative color aftereffects.

Keywords:

hallucination hypnosis negative color aftereffect perception visual imagery

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Area of Science:

Psychology
Neuroscience
Vision Science

Background:

Negative color aftereffects are typically linked to sensory adaptation of opponent processes in color vision.
These aftereffects usually follow prolonged exposure to colored stimuli.

Purpose of the Study:

To investigate whether negative color aftereffects can occur without sensory adaptation.
To explore the role of hallucination and imagination in generating color aftereffects.

Main Methods:

A study involving highly suggestible participants undergoing hypnosis.
Participants were induced to hallucinate seeing the color red.
Comparison of aftereffects generated by hallucination versus imagination.

Main Results:

Negative color aftereffects were perceived by hypnotized participants hallucinating red, despite the absence of a visual stimulus.
These hallucination-induced aftereffects were indistinguishable from those caused by actual red stimulus exposure.
Imagining color was less effective in generating aftereffects compared to hallucination.

Conclusions:

Sensory adaptation is not a necessary mechanism for the occurrence of negative color aftereffects.
Hallucination, particularly in highly suggestible individuals, can elicit genuine negative color aftereffects.
The findings suggest that the experience of hallucination involves distinct processes beyond simple imagination.