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Related Experiment Video

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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

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Published on: April 16, 2014

Suggested visual blockade during hypnosis: Top-down modulation of stimulus processing in a visual oddball task.

Marcel Franz¹, Barbara Schmidt¹, Holger Hecht¹

¹Institute of Psychology, Friedrich Schiller University of Jena, Jena, Germany.

|September 15, 2021

Summary

Hypnotic suggestions impairing vision reduce brain activity in attention and executive control networks. This study found reduced frontoparietal network connectivity during hypnosis, impacting cognitive control.

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Area of Science:

Cognitive Neuroscience
Psychology
Neuroimaging

Background:

Hypnosis theories suggest top-down modulation via frontoparietal networks for cognitive control.
Previous research implicates frontoparietal networks in response to hypnotic suggestions.
Understanding the neural mechanisms of hypnotic suggestion is crucial for cognitive control research.

Purpose of the Study:

To investigate the neural underpinnings of hypnotic suggestions affecting visual perception.
To examine the role of the frontoparietal network in hypnosis-induced visual blockade.
To analyze event-related potentials (ERPs) and brain connectivity during hypnotic suggestion.

Main Methods:

Re-analysis of published event-related potentials (ERPs) including N1, P2, and P3b amplitudes.
Application of source reconstruction and time-frequency effective connectivity analysis.
Comparison of hypnosis (HYP) and control (CON) conditions using a visual oddball paradigm.

Main Results:

Counting accuracy was significantly impaired during hypnosis compared to the control condition.
P3b amplitudes in response to target stimuli were significantly reduced during HYP.
Reduced activity in occipital and parietal areas and decreased directed information flow from parietal to frontal sources were observed during HYP.

Conclusions:

Hypnotic suggestions of visual blockade are associated with impaired cognitive control.
Findings suggest a disruption in the frontoparietal network's top-down control during hypnosis.
This study provides preliminary evidence for altered neural connectivity underlying hypnotic suggestion effects.