Creative Brains Show Reduced Mid Frontal Theta

Wokke, Martijn E.; Padding, Lisa; Ridderinkhof, K. Richard · 2018 · Crossref

DOI: 10.1101/370494

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Summary

This study investigates the neural mechanisms underlying creative thinking, specifically examining the role of top-down control and large-scale network interactions. While creativity is often linked to innovation, its neurocognitive basis remains elusive, with debates centering on whether enhanced or reduced cognitive control facilitates creative processes. The authors hypothesized that fluctuations in mid-frontal theta oscillations (4–7 Hz), a known marker of top-down control, would correlate with variations in creative performance. To test this, nineteen participants performed a “caption this” task, generating original and apt one-sentence captions for 200 presented images while electroencephalographic (EEG) signals were recorded. Creativity was assessed by two independent raters who scored each caption on a scale of 1 to 4 based on originality and aptness. The experimental design allowed for the analysis of single-trial fluctuations in neural activity relative to creativity scores. Participants pressed a spacebar upon idea generation, after which the image disappeared, and they typed their caption. This design enabled the isolation of neural activity during the optimization and implementation phase of creative thought, distinct from initial idea generation. The results revealed a significant negative correlation between mid-frontal theta power and creativity levels, but exclusively during the 500 ms window following the spacebar press, when participants were refining and implementing their solutions. Lower theta power, indicating reduced top-down control, was associated with higher creativity scores. Conversely, no significant correlations were found between creativity and alpha band activity (8–12 Hz), nor were there differences in theta or alpha power between trials characterized by “sudden insight” versus “analytical thought.” Additionally, reaction times did not correlate with creativity or theta power, ruling out uncertainty or response preparation as confounding factors. Crucially, the study found a strong positive correlation between creativity and functional connectivity, measured as theta phase synchrony, between the mid-frontal cortex (FCz) and the occipital cortex (POz). These findings suggest that creativity benefits from a top-down induced shift toward an internally oriented state during the optimization and evaluation of ideas. Reduced mid-frontal theta activity may reflect a release of external attentional control, facilitating the integration of distributed neural representations. The enhanced frontal-occipital connectivity supports the maintenance and manipulation of internal representations in the absence of external stimuli. The study concludes that creative thinking relies on dynamic large-scale network interactions, balancing internally and externally oriented processes, rather than static activation in specific brain regions. This challenges traditional dichotomies of divergent versus convergent thinking and highlights the importance of examining the creative product itself to understand the neural dynamics of innovation.

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• neuro workload indices