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April 26

Today's sense is touch. A lab will investigate how well different body parts can distinguish between one or two points of contact. The "sensory homunculus" diagram shows that areas with more nerves, like hands and face, take up more space in the brain, allowing for finer touch discrimination. Students will use toothpicks of varying distances on their skin to determine how close points must be to feel separate, and see if this differs by body part.

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42 views5 pages

April 26

Today's sense is touch. A lab will investigate how well different body parts can distinguish between one or two points of contact. The "sensory homunculus" diagram shows that areas with more nerves, like hands and face, take up more space in the brain, allowing for finer touch discrimination. Students will use toothpicks of varying distances on their skin to determine how close points must be to feel separate, and see if this differs by body part.

Uploaded by

api-292905822
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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TUESDAY!

Todays sense: touch!

Feels like 2 points

Feels like 1 point

The Sensory Homunculus

This is a representation of
the relative amount of
brainspace given to sense
each part of the body.
What do you notice?
How does this relate to the
amount of nerves in each
area?

Todays Lab: Two-Point Discrimination


Lab Question: How far apart on the skin must two pointed objects be in order
for a person to tell that there are two objects rather than one? Is this
consistent across the body, or will different body parts be better at this than
others?
Collect a lab guide, a ruler, a cork, and two toothpicks for your group. Read the
background information and formulate a hypothesis before completing the
lab.
RETURN THE RULER & CORK WHEN LAB IS COMPLETE! Throw away the
toothpicks.

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