Placebo-suggestion modulates conflict resolution in the Stroop Task
Pedro A Magalhães De Saldanha da Gama1, Hichem Slama, Emilie A Caspar
1CO3 - Consciousness, Cognition & Computation Group, Université Libre de Bruxelles (ULB), Brussels, Belgium ; CRCN - Center for Research in Cognition & Neurosciences, Université Libre de Bruxelles (ULB), Brussels, Belgium ; UNI - The ULB Neurosciences Institute, Université Libre de Bruxelles (ULB), Brussels, Belgium.
Plos One
|October 17, 2013
Summary
Placebo suggestions, not hypnosis, can alter cognitive conflict resolution. Positive suggestions improved Stroop task accuracy, while negative ones worsened it, demonstrating the power of expectation.
Area of Science:
- Cognitive psychology
- Neuroscience
- Psychology
Background:
- Cognitive conflict arises when processing conflicting information.
- Placebo effects are well-documented but their impact on cognitive conflict resolution is less understood.
- Distinguishing placebo effects from imaginative suggestion is crucial for understanding their mechanisms.
Purpose of the Study:
- To investigate if placebo-suggestion can modulate cognitive conflict resolution without hypnotic induction.
- To compare the effects of placebo-suggestion with non-hypnotic imaginative suggestion.
- To examine the impact of positive and negative suggestions on performance in the Stroop Task.
Main Methods:
- Participants performed the Stroop Task while wearing an EEG cap.
- Experiment 1: Participants received placebo-suggestion about the EEG cap's effects (enhancing or decreasing performance).
- Experiment 2: Participants were instructed to imagine performance modulation (non-hypnotic imaginative suggestion).
Main Results:
- Placebo-suggestion significantly affected Stroop interference on accuracy: positive suggestions decreased interference, negative suggestions increased it.
- Negative placebo-suggestion increased intra-individual variability in performance.
- Non-hypnotic imaginative suggestion did not affect accuracy but negatively impacted response latencies and intra-individual variability.
Conclusions:
- Expectations induced by placebo-suggestion can modulate the ability to resolve cognitive conflict, impacting response accuracy.
- A dissociation exists between placebo-suggestion and non-hypnotic imaginative suggestion in modulating cognitive performance.
- Placebo-suggestion offers a unique pathway to influence cognitive conflict resolution, distinct from direct imaginative suggestion.
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