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Hypnosis reduces decoding accuracy of visual and auditory representations.

Mi Zhang¹, Yongyi Li¹, Lijun Ma¹

¹School of Mental Health and Psychological Science, Anhui Medical University, Hefei, Anhui, China.

Brain Research Bulletin

|June 24, 2026

Summary

This summary is machine-generated.

Hypnosis reduces perceptual efficiency by altering neural temporal dynamics and representational specificity, impacting visual and auditory processing. This neurobiological evidence explains perceptual dissociation during hypnosis.

Keywords:

Conscious states Hypnosis Multivariate pattern analysis Neural representations

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Area of Science:

Cognitive Neuroscience
Neuroimaging
Psychology

Background:

Hypnosis is a state of consciousness involving focused attention and reduced peripheral awareness.
Understanding the neural mechanisms of hypnosis is crucial for explaining altered states of consciousness and perceptual changes.

Purpose of the Study:

To investigate how hypnosis modulates visual and auditory processing using neuroimaging techniques.
To explore the neural basis of perceptual dissociation under hypnosis.

Main Methods:

Event-related potentials (ERPs), time-frequency analysis, and multivariate pattern analysis (MVPA) were employed.
Twenty-two highly hypnotizable participants performed an independent oddball task under hypnosis and wakefulness.
Hypnotic suggestion focused on "seeing without perceiving, hearing without listening."

Main Results:

Hypnosis decreased target detection accuracy and increased reaction times, while maintaining low false alarm rates.
Event-related potential (ERP) analysis showed attenuated P300 component under hypnosis, indicating reduced cognitive evaluation.
Multivariate pattern analysis (MVPA) revealed delayed neural decoding onset and reduced temporal stability of neural representations during hypnosis.
Time-frequency analysis indicated diminished neural representational specificity in the delta-band for visual stimuli under hypnosis.

Conclusions:

Hypnotic suggestions, when internalized, engage top-down regulatory mechanisms.
These mechanisms alter neural temporal dynamics, reduce representational specificity, and lead to more homogeneous neural coding.
This results in decreased perceptual efficiency while preserving weak decodability, providing neurobiological evidence for perceptual dissociation in hypnosis.