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Can hypnosis displace the threshold for visual consciousness?
Hernán Anlló1,2, Jérôme Sackur1,3,4
1Département d'Études Cognitives (École Normale Supérieure - PSL Research University), Laboratoire de Sciences Cognitives et Psycholinguistique (ENS, EHESS, CNRS), Paris, France.
Neuroscience of Consciousness
|November 30, 2018
Summary
Hypnosis can alter visual awareness by affecting attention, but it does not reduce conscious stimuli to an unconscious level. Highly susceptible individuals experienced changes in awareness without processing interference.
Area of Science:
- Cognitive Neuroscience
- Psychology
Background:
- Hypnosis is a state of consciousness that can affect attention and awareness.
- Balint Syndrome is characterized by visual inattention, including tunnel vision.
Purpose of the Study:
- To investigate the specific effects of hypnosis on attentional components of visual awareness.
- To examine if hypnotic suggestions can induce peripheral visual inattention.
Main Methods:
- Developed a posthypnotic suggestion for peripheral visual inattention.
- Used a dual-target visibility and discrimination paradigm with targets in central and peripheral visual fields.
- Compared highly susceptible (Highs) and low susceptible (Lows) participants.
Main Results:
- Highly susceptible participants reported decreased subjective visibility of peripheral targets.
- Highs did not exhibit dual-task interference from unattended peripheral targets, unlike Lows.
- Highs showed comparable discrimination accuracy to Lows for peripheral targets despite altered awareness.
Conclusions:
- Hypnotic manipulation of visuospatial attention induces experiential changes in highly susceptible individuals.
- These changes involve awareness fluctuation and strategic task set modification, not a simple shift to subliminal processing.
- Hypnosis cannot be used to render supraliminal stimulation effectively subliminal.
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