MS-LS1-8: Senses, Signals and Memory
Also called NGSS MS-LS1-8 · Topic: Structure, Function, and Information Processing · Life Science
The Official Wording
Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.
Assessment boundary: Assessment does not include mechanisms for the transmission of this information.
NGSS Lead States, 2013 · Read it on nextgenscience.org · checked October 15, 2026
What MS-LS1-8 Means in Plain English
Students gather information from texts, videos and simple tests about how sense receptors in the skin, eyes, ears, nose and tongue detect changes and send messages to the brain. The brain then acts right away, like ducking from a flying ball, or stores a memory.
Students do not need to explain how nerve signals travel, only that receptors respond and messages reach the brain. This builds on 4-LS1-2, where animals process senses in the brain, and connects to body systems in MS-LS1-3.
MS-LS1-8 I Can Statements
- I can name sense receptors and the changes they detect.
- I can explain how messages from receptors reach the brain.
- I can tell a quick reaction from a stored memory.
MS-LS1-8 Worked Example
A touch test a class can run in pairs with two toothpicks and a metric ruler.
Are touch receptors packed more closely on some parts of the body than others?
Set It Up: Two toothpicks, a metric ruler and a partner who keeps their eyes closed.
- Touch the fingertip with both toothpick points 3 mm apart, and sometimes with just one point.Fingertip: two points felt
- Widen the spacing on the forearm until your partner reports two points every time.Forearm: two points only at 35 mm
- Repeat on the palm and the back of the neck.Palm 10 mm, neck 40 mm
- Mix in single touches to check your partner is not guessing.Single touches reported as one
- Record the smallest spacing felt as two for each spot.Fingertip smallest, neck largest
The fingertip told two points apart at about 3 mm, while the forearm needed about 35 mm.
Why it works: Fingertips hold many more touch receptors, each sending its own message to the brain, so the brain can tell close touches apart.
Common Mistakes with MS-LS1-8
Thinking the body part does the feeling
“My finger feels the toothpick.”
Try this: Receptors in the finger detect the touch, but the feeling happens when the message reaches the brain and is interpreted there.
Giving each sense organ one job
“Skin only senses touch.”
Try this: Skin holds several kinds of receptors, for light touch, pressure, heat, cold and pain, each responding to a different change.
Forgetting the memory path
Explaining every signal as an instant reaction
Try this: Some messages are stored instead of acted on, like remembering the smell of a bakery. Storing a memory is also a brain response.
Where MS-LS1-8 Fits
Practice MS-LS1-8
Quick Check
- Why can a reader feel Braille dots with a fingertip but not with an elbow?
- You smell cookies and suddenly remember a relative's kitchen. What happened?
- A ball flies toward your face and you blink. Which receptors started this?