AI Summary
5 min readYour Brain Is Not Fixed: Seven Facts That Change How You Think About Thinking
The human brain accounts for just 2% of body mass but consumes 20% of your energy. In infants, that figure jumps to 60% of daily caloric intake. From an evolutionary perspective, there is no way such an energy-costly organ could be mostly unused—yet the myth that we only use 10% of our brain persists, thanks largely to movies like Lucy and Limitless. That myth originated with Harvard psychologists William James and Boris Sidis in the 1890s, who had no evidence for their claim. MRI technology later revealed widespread ongoing activity across nearly all brain regions at any given time, even during sleep. The 10% figure is simply too neat, too universal, and too convenient to be true.
The Brain Rewires Itself Constantly
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What you'll learn
- 1 (03:26) **Introduction: Why Your Brain Works the Way It Does** - Host Jemma Sbeg introduces the episode’s premise: seven surprising, science-backed facts about the brain that explain everyday psychological experiences like forgetting breakfast but remembering an embarrassing moment from years ago.
- 2 (06:16) **Fact #1: Neuroplasticity – Your Brain Can Physically Rewire Itself** - The brain’s ability to change its structure and function in response to experience, injury, or learning is explained as its “first superpower.”
- 3 (15:34) **Fact #2: Your Brain Feels Pain, Not Your Body – Emotional Pain Is Physical** - Physical and emotional pain share the same neural pathways, meaning social rejection activates the same brain regions (anterior insular and anterior cingulate cortex) as physical injury.
- 4 (25:11) **Fact #3: Debunking the 10% Brain Myth** - The popular idea that we only use 10% of our brain—popularized by movies like *Lucy* and *Limitless*—is completely false.
- 5 (29:30) **Fact #4: The Gut-Brain Axis – Your Stomach Is Your Second Brain** - A two-way communication pathway called the gut-brain axis physically and chemically connects the gut and brain via the vagus nerve and neurotransmitters.
- 6 (34:43) **Fact #5: Your Brain Cannot Multitask** - Despite popular belief, the brain is incapable of effectively performing two tasks simultaneously; it rapidly switches attention, incurring a cognitive cost.
- 7 (43:40) **Fact #6: Your Brain Does Not Stop Developing at 25** - The myth that the frontal lobe “locks in” at age 25 is a misinterpretation of old research; brain development is a lifelong process with multiple turning points.
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Show Notes
There are a surprising number of myths and misconceptions about the brain, particularly with regards to its development in our 20s. In this episode, we unpack a number of surprising facts and studies about the brain so that we can in turn better understand how to make the most of our 20s.
Watch on Netflix: HERE
We unpack:
• The science of neuroplasticity and how our brain can rewire itself
• Why, on a cognitive level, a broken heart may not be so different from a broken arm
• How much of our brains we really use (hint - it’s more than 10%!)
• The gut-brain axis and why poor gut health can cause depression - not the other way around
• Why our brain needs to forget to function properly
• The real age our brain stops developing
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