Sept 19, 2013Sept 19, 2013

• I can define stimulus and response I can define stimulus and response and give examples.and give examples.

Stimulus and ResponseStimulus and Response

Why animals and plants do what they Why animals and plants do what they do do

OROR

A fancy way of saying A fancy way of saying causecause and and effecteffect in the animal world. in the animal world.

CatalystCatalyst

1. Find vocab card for stimulus.1. Find vocab card for stimulus.

2. Under more understanding describe 2. Under more understanding describe a situation in which you were a situation in which you were immediately scared and/or reacted immediately scared and/or reacted quickly to something. Write at least quickly to something. Write at least 2 sentences describing your 2 sentences describing your experience.experience.

What is a stimulus?What is a stimulus?

Stimulus:Stimulus: any change in an any change in an organism’s environment that organism’s environment that causes the organism to react. causes the organism to react.

It is a fancy way of saying “cause”.It is a fancy way of saying “cause”.

Example: An animal is cold so it moves into the sun.Example: An animal is cold so it moves into the sun.

What is a response?What is a response?

Response:Response: how the organism how the organism reacts to a stimulus and results reacts to a stimulus and results in a change in behavior.in a change in behavior.

It is a fancy way of saying “effect”.It is a fancy way of saying “effect”.

Example: Getting a drink when you are Example: Getting a drink when you are thirsty.thirsty.

Examples of stimuli and their Examples of stimuli and their responses:responses:

• A rabbit gets scared A rabbit gets scared so it runs awayso it runs away

• You are feeling cold You are feeling cold so you put on a so you put on a jacketjacket

• A dog is hot A dog is hot so lies in the shadeso lies in the shade

• It starts raining It starts raining so you take out an so you take out an umbrellaumbrella

Think – Pair - ShareThink – Pair - Share

Turn to your partner Turn to your partner and share two other and share two other stimuli and their stimuli and their responses. responses.

There are two types of There are two types of stimuli:stimuli:

External StimulusExternal Stimulus

andand

Internal StimulusInternal Stimulus(Create a t-chart with external (Create a t-chart with external

stimulus on one side and internal stimulus on one side and internal stimulus on the other.)stimulus on the other.)

External StimulusExternal Stimulus

External stimulus: a stimulus that External stimulus: a stimulus that comes from outside an organism.comes from outside an organism.

Examples: Examples: 1. You feel cold so you put on a jacket.1. You feel cold so you put on a jacket.2. A snake lunges at a rabbit so it runs away.2. A snake lunges at a rabbit so it runs away.3. A dog feels hot so it goes to lay in the shade.3. A dog feels hot so it goes to lay in the shade.

Internal StimulusInternal Stimulus

Internal stimulus:Internal stimulus: a stimulus that a stimulus that comes from inside an organism.comes from inside an organism.

Examples: Examples: 1. You feel hungry so you eat some food.1. You feel hungry so you eat some food.2. A cat feels thirsty so it drinks water.2. A cat feels thirsty so it drinks water.

Write the sentence of each stimulus in the Write the sentence of each stimulus in the proper column on your t-chartproper column on your t-chart(Discuss this with your table)(Discuss this with your table)

• You have a stomach ache and decide to You have a stomach ache and decide to lay down.lay down.

• A bird is thirsty and drinks some water.A bird is thirsty and drinks some water.

• A squirrel sees a cat and runs up a tree.A squirrel sees a cat and runs up a tree.

• A lion gets hungry and eats a gazelle.A lion gets hungry and eats a gazelle.

• You see a spider and scream.You see a spider and scream.

Animals can respond to stimuli Animals can respond to stimuli in two ways:in two ways:

1. In a way that they develop with 1. In a way that they develop with experience. We call this experience. We call this learned learned behavior.behavior.

OROR

2. In a way that they were just born 2. In a way that they were just born knowing how to do. We call this knowing how to do. We call this instinct.instinct.

Learned behavior:Learned behavior: a response to a a response to a stimulus that an stimulus that an animal was animal was taught.taught.

A mother bear teaching her A mother bear teaching her cubs to fishcubs to fish

Teaching an animal a trickTeaching an animal a trick

Training a dogTraining a dog

Even Even youyou have learned have learned behavior. For example, you behavior. For example, you learned to read and to talk.learned to read and to talk.

Now instinctive Now instinctive behaviorsbehaviors

Animals natural instinct is to Animals natural instinct is to run away from danger. We call run away from danger. We call this the need for safety. this the need for safety.

Animals will naturally find or Animals will naturally find or make themselves a home make themselves a home because they have a need for because they have a need for shelter. shelter.

Animals will naturally look for Animals will naturally look for food and water. food and water.

Animals that need to will Animals that need to will naturally migrate. naturally migrate.

Animals instinctually know to Animals instinctually know to store their food for the winter.store their food for the winter.

1.1. What is a stimulus?What is a stimulus?2.2. What is a response?What is a response?3.3. Give one example of a stimulus and its Give one example of a stimulus and its

response.response.4.4. What is an internal stimulus?What is an internal stimulus?5.5. What is an external stimulus?What is an external stimulus?6.6. It is raining and you open up an It is raining and you open up an

umbrella. Is this an internal or external umbrella. Is this an internal or external response? Justify your answer. response? Justify your answer.

7.7. What is learned behavior?What is learned behavior?8.8. What is an instinct?What is an instinct?9.9. When a rabbit runs away from a wolf is When a rabbit runs away from a wolf is

this learned behavior or instinct? Justify this learned behavior or instinct? Justify your answeryour answer..