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• W830505655 endingPage "e0130492" @default.
• W830505655 startingPage "e0130492" @default.
• W830505655 abstract "The influence of positive or negative expectations on clinical outcomes such as pain relief or motor performance in patients and healthy participants has been extensively investigated for years. Such research promises potential benefit for patient treatment by deliberately using expectations as means to stimulate endogenous regulation processes. Especially regarding recent interest and controversies revolving around cognitive enhancement, the question remains whether mere expectancies might also yield enhancing or impairing effects in the cognitive domain, i.e., can we improve or impair cognitive performance simply by creating a strong expectancy in participants about their performance? Moreover, previous literature suggests that especially subjective perception is highly susceptible to expectancy effects, whereas objective measures can be affected in certain domains, but not in others. Does such a dissociation of objective measures and subjective perception also apply to cognitive placebo and nocebo effects? In this study, we sought to investigate whether placebo and nocebo effects can be evoked in cognitive tasks, and whether these effects influence objective and subjective measures alike. To this end, we instructed participants about alleged effects of different tone frequencies (high, intermediate, low) on brain activity and cognitive functions. We paired each tone with specific success rates in a Flanker task paradigm as a preliminary conditioning procedure, adapted from research on placebo hypoalgesia. In a subsequent test phase, we measured reaction times and success rates in different expectancy conditions (placebo, nocebo, and control) and then asked participants how the different tone frequencies affected their performance. Interestingly, we found no effects of expectation on objective measures, but a strong effect on subjective perception, i.e., although actual performance was not affected by expectancy, participants strongly believed that the placebo tone frequency improved their performance." @default.
• W830505655 created "2016-06-24" @default.
• W830505655 creator A5033792391 @default.
• W830505655 creator A5066671649 @default.
• W830505655 date "2015-07-06" @default.
• W830505655 modified "2023-10-16" @default.
• W830505655 title "Cognition and the Placebo Effect – Dissociating Subjective Perception and Actual Performance" @default.
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• W830505655 doi "https://doi.org/10.1371/journal.pone.0130492" @default.
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• W830505655 hasPublicationYear "2015" @default.
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