Stage 1. Claim Extraction The core claim is that humans only use 10 percent of their brains, implying that 90 percent remains unused or inactive. Stage 2. Contextual Cross-Check This claim conflicts with well-established neuroscience. Brain imaging technologies such as fMRI and PET scans consistently show activity across nearly all regions of the brain, even during simple tasks or rest. Different areas are responsible for different functions, and no large portion is completely inactive. Stage 3. Logical Stress Test If 90 percent of the brain were unused, damage to those areas would have little to no effect. In reality, even small brain injuries can lead to significant impairments, indicating that most regions have functional importance. Additionally, from an evolutionary perspective, maintaining a large, energy-demanding organ like the brain would be inefficient if most of it were unused. Stage 4. Risk Scoring High Stage 5. Audit Summary The claim lacks scientific support and contradicts extensive neurological evidence. It is a commonly repeated myth rather than a factual statement. Final Assessment Risk Score High Audit Grounds The evaluation is based on established neuroscience research, brain imaging data, clinical evidence from brain injuries, and evolutionary biology principles. All lines of evidence consistently indicate that the brain is broadly active and functionally utilized, making the 10 percent claim highly unreliable.