1.2 Stimuli and Responses in Humans

1.2 Stimuli and Responses in Humans

By KASMAWATI Moe

Stimuli

• A stimulus is a change in an environment that causes a change in behavior.

• Organisms maintain stability by responding to changes, or stimuli, in their environment.

• A change is known as a response.

Two Kinds of Stimuli

• Internal Stimuli Comes from inside of an organism

• External Stimuli comes from outside of an organism

Multiple Choice

Identify the response:
You are at the mall walking through the food court. You smell fresh baked pizza and realize that you skipped lunch.  You buy a piece of pizza and eat it before going to buy your CD

• the smell of pizza
• buying a piece of pizza
• buying the CD
• food court

Multiple Choice

Identify the response:
You are walking home from school one day when a large dog jumps out at you from behind a tree.  He starts to growl and shows his teeth.  You quickly turn around and walk in the opposite direction. 

• dog growling and showing teeth
• you quickly turn and walk away
• tree
• dog

Multiple Choice

Identify the stimulus: You are walking home from school one day when a large dog jumps out at you from behind a tree.  He starts to growl and shows his teeth.  You quickly turn around and walk in the opposite direction. 

• Dog growling and showing teeth
• walking in opposite direction
• walking home from school
• tree

Multiple Choice

Is the stimulus internal or external? Feeling hungry

• Internal

• External

Multiple Choice

Identify the response..."An organism is hungry so it eats some food"

• Feeling hungry

• Eating food

Multiple Choice

Identify the response..."A squirrel scratches at a flea bite"

• A flea bite

• A squirrel scratches

Multiple Choice

What type of stimulus?
Touch a hot skillet

• Internal
• External

Multiple Choice

What type of stimulus?
Loud fire alarm

• Internal
• External

Multiple Choice

What type of stimulus?

The smell of pizza

• Internal

• External