The suggestible brain: posthypnotic effects on value-based decision-making

Autor(en): Ludwig, Vera U.
Steze, Christine
Krutiak, Harald
Magrabi, Amadeus
Steimke, Rosa
Paschke, Lena M.
Kathmann, Norbert
Walter, Henrik
Stichwörter: COGNITIVE-BEHAVIORAL PSYCHOTHERAPY; CONFLICT; GOAL VALUES; hypnosis; HYPNOTIC SUGGESTION; MODULATION; NEURAL REPRESENTATIONS; Neurosciences; Neurosciences & Neurology; ORBITOFRONTAL CORTEX; precuneus; Psychology; Psychology, Experimental; self-control; SELF-HYPNOSIS; VALUATION; VALUE SIGNALS; value-based decision-making; ventromedial prefrontal cortex
Erscheinungsdatum: 2014
Herausgeber: OXFORD UNIV PRESS
Journal: SOCIAL COGNITIVE AND AFFECTIVE NEUROSCIENCE
Volumen: 9
Ausgabe: 9
Startseite: 1281
Seitenende: 1288
Zusammenfassung: 
Hypnosis can affect perception, motor function and memory. However, so far no study using neuroimaging has investigated whether hypnosis can influence reward processing and decision-making. Here, we assessed whether posthypnotic suggestions can diminish the attractiveness of unhealthy food and whether this is more effective than diminishing attractiveness by one's own effort via autosuggestion. In total, 16 participants were hypnotized and 16 others were instructed to associate a color cue (blue or green) with disgust regarding specific snacks (sweet or salty). Afterwards, participants bid for snack items shown on an either blue or green background during functional magnetic resonance imaging measurement. Both hypnosis and autosuggestion successfully devalued snacks. This was indicated by participants' decision-making, their self-report and by decreased blood oxygen level-dependent signal in the ventromedial prefrontal cortex (vmPFC), a region known to represent value. Different vmPFC subregions coded for cue and snack type. The cue had significantly stronger effects on vmPFC after hypnosis than after autosuggestion, indicating that hypnosis was more effective in genuinely reducing value. Supporting previous findings, the precuneus was involved in the hypnotic effects by encoding whether a snack was sweet or salty during hypnotic cue presentation. Our results demonstrate that posthypnotic suggestions can influence valuation and decision-making.
ISSN: 17495016
DOI: 10.1093/scan/nst110

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