Stimulus and Response

1
Stimulus and Response

• Why animals and plants do what they do
• OR
• A fancy way of saying cause and effect in the
  animal world.

2
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 journals and your colors.

3
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.

4
What is a stimulus?

• Stimulus any change in an organisms environment
  that causes 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 journal)

5
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 journal)

6
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

7
Plants also respond to their environment. When a
plant grows towards the sun we call this
phototropism.
8
Think Pair - Share

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

9
There are two types of stimuli

• External Stimuli
• and
• Internal Stimuli

10
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 journal.

11
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 journal.

12
Make a T-chart in your journal 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.

13
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.

14

• Learned behavior a response to a stimulus that
  an animal was taught.
• Add this word to your journal

15
A mother bear teaching her cubs to fish
16
Teaching an animal a trick
17
Training a dog
18
Even you have learned behavior. For example, you
learned to read and to talk.
19

• Instinct an animals natural reaction to a
  stimulus. It is an automatic reaction that the
  animal was not taught to do.
• Add this word to your journal

20
Animals natural instinct is to run away from
danger. We call this the need for safety.
21
Animals will naturally find or make themselves a
home because they have a need for shelter.
22
Animals will naturally look for food and water.
23
Animals that need to will naturally migrate.
24
Animals instinctually know to store their food
for the winter.
25
Think Write - Share

• In your journal write down one learned behavior
  that you have and one instinct that you have.

26
Summarize what you have learned today.

• 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?

27

• It is raining and you open up an umbrella. Is
  this an internal or external response? Justify
  your answer.
• What is an instinct?
• When a rabbit runs away from a wolf is this
  learned behavior or instinct? Justify your
  answer.