The claim that humans only use 20-30% or even 10% of their brains is widely regarded as a myth, lacking scientific support. Discussions reveal that this misconception may stem from misinterpretations of early neuroscience studies and quotes from historical figures like Albert Einstein and William James. The brain is an expensive organ that would not have evolved to its current size if large portions were unused; its development suggests that all areas serve essential functions. Neuroscientific evidence shows that various brain regions are active depending on tasks, and even when not consciously engaged, the entire brain is metabolically active. The myth persists partly due to popular media portrayals, such as the film "Limitless," which perpetuate the idea that untapped potential exists within the brain. Overall, the consensus is that while not all neurons fire simultaneously, the entire brain is utilized in different capacities, making the notion of "unused" brain areas misleading.
