On the (non)persuasive power of a brain image |
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Authors: | Robert B Michael Eryn J Newman Matti Vuorre Geoff Cumming Maryanne Garry |
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Institution: | 1. School of Psychology, Victoria University of Wellington, PO Box 600, Wellington, New Zealand, 6147 2. School of Psychological Science, La Trobe University, Melbourne, Australia
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Abstract: | The persuasive power of brain images has captivated scholars in many disciplines. Like others, we too were intrigued by the finding that a brain image makes accompanying information more credible (McCabe & Castel in Cognition 107:343-352, 2008). But when our attempts to build on this effect failed, we instead ran a series of systematic replications of the original study—comprising 10 experiments and nearly 2,000 subjects. When we combined the original data with ours in a meta-analysis, we arrived at a more precise estimate of the effect, determining that a brain image exerted little to no influence. The persistent meme of the influential brain image should be viewed with a critical eye. |
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