We watched the film Lucy on iTunes last night and, while reasonably entertaining, its plot is founded on a persistent bit of pseudoscience: that people only use 10% of their brain capacity. It’s so widespread a myth that Wikipedia has a page on it that opens:
The 10 percent of the brain myth is the widely perpetuated urban myth that most or all humans only make use of 10 percent (or some other small percentage) of their brains. It has been misattributed to many people, including Albert Einstein. By extrapolation, it is suggested that a person may harness this unused potential and increase intelligence.
Sure, we all know people who don’t appear to use much of their brain’s potential power, but the simple truth is that we all use all of our brain’s capacity. We evolved a big brain to handle the growing demands of increased consciousness, speech and sophisticated motor control, and that’s what it’s for.
Sure, not all of it is used in a conscious manner. Much of the brain’s function is taken up in processing, storing and interpreting the huge bandwidth of information that is fed to it every second of every day. Even acts we do daily and take for granted – like walking upstairs with a cup of tea in one hand while talking – take a huge amount of processing power. Sight, balance, motor control, memory, logic, vocalization, muscles control… the brain takes care of it all without spilling a drop.
Your consciousness – the ego – doesn’t see all this work going on and never will because you would quickly be overwhelmed by the huge amount of data being managed by your unconscious. Yes, yes, a lot of people don’t appear to even use the whole capacity of their conscious brains – anti-vaxxers, chemtrail wingnuts, creationists and some local bloggers come to mind – but that’s just a portion of what the brain does. Critical thinking is a skill one has to acquire and practice, not an inherent brain function.