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Effects of alpha and gamma transcranial alternating current stimulation (tACS) on verbal creativity and intelligence test performance.

Abstract：

:Transcranial alternating current stimulation (tACS) is a non-invasive brain stimulation method that allows to directly modulate brain oscillations of a given frequency. Using this method, it was recently shown that increasing alpha (10Hz) oscillations improved creative ideation with figural material and that increasing gamma (40Hz) oscillations speeded up performance in a figural matrices intelligence task. The aim of the present study was to examine whether these findings generalize to verbal creativity and intelligence tasks. In addition, we explored whether the stimulation effects are moderated by individual differences in creative potential and intelligence. Twenty-two adults received 10Hz, 40Hz and sham tACS while they worked on a verbal creativity (alternate uses) task and a verbal intelligence (anagram) task. Analyses revealed that 10Hz stimulation had a marginally significant effect on ideational fluency in the alternate uses task, whereas originality was unaffected. The beneficial effect of stimulation on fluency tended to emerge mainly in the individuals with higher creative potential. In the verbal intelligence task, in contrast, 40Hz stimulation did neither impact on performance nor interacted with individual differences in intelligence. These findings provide first tentative evidence that enhancing alpha oscillations through tACS may improve creative thinking not only in the figural but also in the verbal domain. The previously reported beneficial effect of gamma tACS on figural intelligence, however, could not be observed in a verbal task. In sum, the present study further corroborates the causal link between alpha oscillations and creative thinking and suggests that tACS may be a promising tool to enhance cognitive processes.

journal_name

Neuropsychologia

journal_title

Neuropsychologia

authors

Grabner RH,Krenn J,Fink A,Arendasy M,Benedek M

doi

10.1016/j.neuropsychologia.2017.10.035

subject

Has Abstract

pub_date

2018-09-01 00:00:00

pages

91-98

issue

Pt A

eissn

0028-3932

issn

1873-3514

pii

S0028-3932(17)30411-6

journal_volume

118

pub_type

杂志文章

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