The Human Machine: Mystery 4

Why does it look like you have a hole in your hand when you try the hole-in-the-hand illusion?

• There are holes in your eyes.
• One eye sees a hole and the other eye sees your hand and your brain combines the two.
• Your brain has a hole in it.

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The "cords" that send messages from your senses to the brain are called:

• tendons
• retinas
• nerves

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Movement nerves:

• connect to your senses
• connect to your muscles
• connect to your eyes

Sensory nerves:

• connect to your senses
• connect to your muscles
• connect to your eyes

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Movement nerves are how your ______________ controls your muscles.

• eyes
• hands
• brain

Sensory nerves are how your brain gets messages from your _____________.

• eyes
• muscles
• senses

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True or False: In the "Reaction Time" experiment: 
1.  The eyes sent a message to the brain.
2.  The brain made a decision to grab the ruler.
3.  The brain sent a message to the movement nerves to grab it.

• True
• False

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Sensory nerves run into the muscles.

• True
• False

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Movement nerves run out from the brain and tell the muscles to respond.

• True
• False

What are your 5 senses?

• sight, hearing, taste, touch, smell
• eyes, nose, taste, hearing, touch
• eyes, nose, mouth, ears, tongue

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