Abstract
Creativity pervades many areas of everyday life and is considered highly relevant in several human living domains. Previous literature suggests that the posterior parietal cortex (PPC) is related to creativity. However, none of previous studies have compared the effect of transcranial random noise stimulation (tRNS) over bilateral PPC on both verbal and visual divergent thinking (DT) and Remote Associates Test (RAT) in the same experimental design. Forty healthy participants were randomly assigned to tRNS (100–500 Hz) over bilateral PPC or sham group, for 15 min and current was set at 1.5 mA. Participants’ creativity skills were assessed before and after brain stimulation with the Unusual Uses and the Picture Completion subtests from the Torrance Test of Creative Thinking and the RAT. ANCOVA (baseline scores as covariate) results indicated that tRNS group had significantly higher scores at post-test in RAT and visual originality compared to sham group. Unusual Uses, on the other hand, was not significant. Improvement in RAT suggests the involvement of PPC during via insight solution which may reflect internally directed attention that helps the recombination of remotely associated information. The improvement in visual originality dimension from DT may be due to a higher internally directed attention while reducing externally oriented attention.
Highlights
Information Creativity Basement Assessment Creativity Post Assessment- Inclusion/Exclusion criteria - Informed Consent - Demographic information - Edinburgh Inventory- Remote Associates Test (RAT) (2’45’’) - Picture Completion (2’) - Unusual Uses (2’) 5-8 min. 10 min.5 min. transcranial random noise stimulation (tRNS) or Sham Time 2 min. 15 min.A
The present study investigated the effects of increasing cortical excitability with tRNS over left and right posterior parietal cortex (PPC) on RAT, visual divergent thinking (DT) and verbal DT tasks
We found that tRNS produced a significant and large increase in RAT scores when compared to sham
Summary
Information Creativity Basement Assessment Creativity Post Assessment. - Inclusion/Exclusion criteria - Informed Consent - Demographic information - Edinburgh Inventory. - RAT (2’45’’) - Picture Completion (2’) - Unusual Uses (2’) 5-8 min. Stimulation of the electric field according to Stim Weaver (Neuroelectrics, Spain) software based on a realistic head model derived from the Finite Element Method 33. Red-yellow colors indicate increased magnitude of the total electric field due to tRNS. B. Schematic representation of the experimental procedure (RAT = Remote Associates Test)
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