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Proc Natl Acad Sci U S A. 2016 Jul 5;113(27):7470-4. doi: 10.1073/pnas.1601243113. Epub 2016 Jun 20.

Placebo effects in cognitive training.

Author information

1
Department of Psychology, George Mason University, Fairfax, VA 22030 cyrus.foroughi@gmail.com.
2
Department of Psychology, George Mason University, Fairfax, VA 22030.

Abstract

Although a large body of research shows that general cognitive ability is heritable and stable in young adults, there is recent evidence that fluid intelligence can be heightened with cognitive training. Many researchers, however, have questioned the methodology of the cognitive-training studies reporting improvements in fluid intelligence: specifically, the role of placebo effects. We designed a procedure to intentionally induce a placebo effect via overt recruitment in an effort to evaluate the role of placebo effects in fluid intelligence gains from cognitive training. Individuals who self-selected into the placebo group by responding to a suggestive flyer showed improvements after a single, 1-h session of cognitive training that equates to a 5- to 10-point increase on a standard IQ test. Controls responding to a nonsuggestive flyer showed no improvement. These findings provide an alternative explanation for effects observed in the cognitive-training literature and the brain-training industry, revealing the need to account for confounds in future research.

KEYWORDS:

brain training; cognitive training; fluid intelligence; placebo effects

PMID:
27325761
PMCID:
PMC4941515
DOI:
10.1073/pnas.1601243113
[Indexed for MEDLINE]
Free PMC Article

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