What percentage of the brain is water?

• 50%

• 60%

• 75%

• 90%

Which sense processes the fastest in the brain?

• Sight

• Hearing

• Touch

• Smell

What is a “phantom limb” sensation caused by?

• Neurons in the spinal cord firing randomly

• Miscommunication in the sensory cortex

• Increased neurotransmitter clearance

• Excess dopamine

Why can’t you tickle yourself?

• Your brain predicts your own movements.

• Your neurons don’t respond to internal stimuli.

• Neurotransmitters block the sensation.

• Your body prioritizes external threats.

How long does it take for your brain to decide on an action?

• Instantly

• A few milliseconds

• About 100 milliseconds

• 1 second

What’s unique about mirror neurons?

• They fire when you act or observe someone else acting.

• They only fire in response to sounds.

• They are only found in animals.

• They regenerate after injury.

How much of your brain do you actually use?

• 10%

• 25%

• 50%

• Almost 100%

Which of these is NOT a neurotransmitter?

• Glutamate

• Insulin

• GABA

• Serotonin

Which neurotransmitter makes spicy food feel “hot”?

• Dopamine

• Capsaicin

• Substance P

• Glutamate

What brain region is nicknamed the “reptilian brain”?

• The cortex

• The cerebellum

• The brainstem

• The amygdala