The claim that humans only use 10 percent of their brains is a widely debunked neuroscientific myth; neuroimaging studies constantly show activity across virtually all regions of the brain.
None of the retrieved papers discuss the 10 percent brain myth directly, but the claim itself is a well-known urban legend definitively refuted by modern neuroscience and neuroimaging (such as fMRI and PET scans, referenced generally in papers like [8] and [9]), which demonstrate that nearly all brain regions are active throughout the day, even during sleep.