TED-ED: What percentage of your brain do you use? - Richard E. Cytowic

The video debunks the myth that humans use only 10% of their brains, explaining that this misconception arose from historical misunderstandings. It highlights the significant energy consumption of the human brain compared to other species and the evolutionary advantage provided by cooking, which allows humans to sustain a large number of neurons. The video also discusses the brain's energy efficiency through sparse coding, emphasizing that only a small percentage of neurons are active at any time to conserve energy. It concludes by explaining the limitations of multitasking due to energy constraints and the importance of focusing on one task at a time.

What misconception about brain usage is commonly believed by the public and some science teachers?

• The brain uses 50% of its capacity.

• Only 10% of the brain is used.

• The brain is fully utilized at all times.

• The brain uses 90% of its capacity.

How does the energy consumption of the human brain compare to that of other species?

• It consumes less energy than monkey brains.

• It consumes the same energy as rodent brains.

• It consumes more energy than any other species.

• It consumes more energy relative to its size than other species.

What evolutionary advantage did cooking provide to humans?

• It provided more energy and time for brain development.

• It increased the size of the human brain.

• It allowed humans to eat more raw food.

• It reduced the need for sleep.

What is the primary function of ATP in the brain?

• To decrease energy consumption.

• To store information.

• To maintain electrical charge across membranes.

• To increase neuron firing rate.

What is sparse coding in the context of brain function?

• A method to increase neuron firing.

• A process to enhance multitasking abilities.

• A way to use the least energy while carrying the most information.

• A technique to reduce brain size.

Why is multitasking considered inefficient for the brain?

• It reduces the number of neurons needed.

• It enhances the brain's ability to focus.

• It allows the brain to perform tasks better.

• It increases the brain's energy consumption.

What percentage of brain cells should ideally be active at any given moment for maximum efficiency?

• Between 20% and 30%

• Between 10% and 20%

• Between 1% and 16%

• Between 5% and 25%