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Stimulus And Response

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Stimulus and Response Why animals and plants do what they do OR A fancy way of saying cause and effect in the animal world. Catalyst 1. Describe a situation in…

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Added: May, 12th 2011
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Stimulus and Response
- Why animals and plants do what they do
- OR
- A fancy way of saying cause and effect in the animal world.
Catalyst
- 1. Describe a situation in which you were immediately scared and/or reacted quickly to something. Write at least 1 paragraph with 4 sentences describing your experience.
- 2. Take out your vocab books and your colors.
- 3. Take out your dry erase board.
After today you will be able to:
- 1. Identify and classify stimuli as internal or external
- 2. Define a response.
- 3. Identify behavior as learned behavior or instinct.
What is a stimulus?
- Stimulus: any change in an organism’s environment that causes to the organism to react. It is a fancy way of saying “cause”.
- Stimulus – singular
- Stimuli – plural
- Example: An animal is cold so it moves into the sun.
- (Add this word to your vocabulary book)
What is a response?
- Response: how the organism reacts to a stimulus and results in a change in behavior. It is a fancy way of saying “effect”.
- Example: Getting a drink when you are thirsty.
- (Add this word to your vocabulary book)
Examples of stimuli and their responses:
- You are hungry so you eat some food
- A rabbit gets scared so it runs away
- You are cold so you put on a jacket
- A dog is hot so lies in the shade
- It starts raining so you take out an umbrella
Plants also respond to their environment. When a plant grows towards the sun we call this phototropism .
Think – Pair - Share
- Turn to your partner and share two other stimuli and their responses.
There are two types of stimuli:
- External Stimuli
- and
- Internal Stimuli
External Stimulus
- External stimulus: a stimulus that comes from outside an organism.
- Examples:
- 1. You feel cold so you put on a jacket.
- 2. A snake lunges at a rabbit so it runs away.
- 3. A dog feels hot so it goes to lay in the shade.
- Add this word to your vocabulary book.
Internal Stimulus
- Internal stimulus: a stimulus that comes from inside an organism.
- Examples:
- 1. You feel hungry so you eat some food.
- 2. A cat feels thirsty so it drinks water.
- 3. A dog feels hot so it goes to lay in the shade.
- Add this word to your vocabulary book.
Make a T-chart on your dry erase board and label the columns internal and external . Put the letter of each stimulus in the proper column.
- You have a stomach ache and decide to lay down.
- A bird is thirsty and drinks some water.
- A squirrel sees a cat and runs up a tree.
- A lion gets hungry and eats a gazelle.
- You see a spider and scream.
Animals can respond to stimuli in two ways:
- 1. In a way that they learned. We call this learned behavior.
- OR
- 2. In a way that they were just born knowing how to do. We call this instinct.
- Learned behavior: a response to a stimulus that an animal was taught.
- Add this word to your vocabulary book
A mother bear teaching her cubs to fish
Teaching an animal a trick
Training a dog
Even you have learned behavior. For example, you learned to read and to talk.
- Instinct: an animal’s natural reaction to a stimulus. It is an automatic reaction that the animal was not taught to do.
- Add this word to your vocabulary book
Animals natural instinct is to run away from danger. We call this the need for safety.
Animals will naturally find or make themselves a home because they have a need for shelter.
Animals will naturally look for food and water.
Animals that need to will naturally migrate.
Animals instinctually know to store their food for the winter.
Think – Write - Share
- On your board write down one learned behavior that you have an one instinct that you have.
Summarize what you have learned today. On a sheet of NBP answer the following questions.
- What is a stimulus?
- What is a response?
- Give one example of a stimulus and its response.
- What is an internal stimulus?
- What is an external stimulus?
- It is raining and you open up an umbrella. Is this an internal or external response? Justify your answer.
- What is learned behavior?
- What is an instinct?
- When a rabbit runs away from a wolf is this learned behavior or instinct? Justify your answer .