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As brain stimulation devices and procedures proliferate on the market and enter popular discourse, patients are likely to ask clinicians about using these for clinical treatments and even cognitive enhancement. How these procedures might increase creativity is uncertain. According to previous research, greater creativity (idea generation) might correlate with changes in hemispheric balance (specifically right>left preponderance in prefrontal cortical activity). Competing hypotheses favor heightened activity in left prefrontal and anterior cingulate cortices. To study how various protocols for transcranial direct current stimulation might influence creativity, researchers randomized 90 university students in Germany to one of three 22-minute…