29.3 The Senses

Sponge 7

Please write a short paragraph (3-4 sentences) explaining and giving examples of how drugs alter your brain chemistry.

–Use the vocabulary: addiction, and tolerance, Stimulants or depressants

29.3 The Senses

• Addiction: • physiological need for a substance

– Examples? What does the addiction lead a person to do?• Tolerance: • Takes larger doses of the drug to produce the same effect

– What is happening inside of their brain/body?• Stimulants: • are drugs that increase mental and physical functions (increase

neurotransmitter and electrical signals) – Examples? Effects?

• Depressants: • Cause fewer action potentials and decrease neurotransmitter

– Examples? Effects ?

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Objective

• Today you will explain how the senses detect physical and chemical stimuli by taking The Stroop Effect Color Test.

• What is stimuli?

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Standard 9.e

• Students know the roles of sensory neurons, interneurons, and motor neurons in sensation, thought, and response.

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KEY CONCEPT The senses detect the internal and external environments.

Name the five senses

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• If I blindfolded you and place you in the back of the room would you reach the door?

• Your sensory organs and your brain allow you to perceive stimuli as various sounds, sights, smells, and tastes

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Reactions to stimuli

Ex: Eyes react to bright or dim light by changing the size of your pupils.

Ex: When your skin feels cold _________________.

Other examples?

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The senses help to maintain homeostasis.

• Senses gather stimuli, and send it to the nervous system.

• Nervous system responds to stimuli.– Pupils shrink when too much

light enters the eyes.– Goose bumps when cold air

touches skin.

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The senses detect physical and chemical stimuli.

• The eye contributes to vision

• Humans rely on vision more than any of the other senses

• Eye contains about 70% of all the sensory receptors in the body

• Depends on the amount of light available

“I can’t believe my eyes!”

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• The ear contributes to hearing.

– Collects vibrations- sound waves- from the air– How do we rely on hearing?

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• Taste and smell are closely related.

– Chemoreceptors detect chemicals dissolved in fluid.– How do we rely on taste and smell?

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• The skin senses touch.

– detect pressure – detect damaged tissue (pain)

– detect temperature – How do we rely on touch

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The Stroop Effect Color Test• Draw two columns on your paper• Pair up with a person sitting next to you

Column #1 Column #2

1.

2.

3.

4.

5.

6.

7.

8.

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Directions:

•8 colors will be shown to you

•Say the COLOR of the word shown

•Put a check mark in the column if they answered correctly first

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Blue

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Yellow

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Red

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Green

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Black

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Purple

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Gray

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Orange

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Column #2

•Remember say the COLOR of the word shown

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Red

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Gray

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Orange

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Blue

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Black

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Yellow

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Green

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Purple

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Score your partner: •How many out of 8 in the first and second column?

•Same score?•Different?•Timing?

•Hypothesize why the second list took you longer than the first list.

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The Stroop Effect

•Psychologist John Stroop studied the processing of words and how these thought processes affected other mental tasks.

•He found that the brain must override an automatic response when it receives conflicting information, or interference

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How much detail can you remember?

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• How many people were in the picture?• 4• What was the man reading the newspaper

wearing?• Hat, green jacket• How many of the men had sunglasses?• 2- one wearing them, one hanging on shirt• Describe the man on the left.• Tan jacket, white shirt with a blue design,

had a beard, white, blue eyes

What can you remember?

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Why can’t you remember some of the information?

Our brain distinguishes between things that are important or not important when interacting with the environment.

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3 composite sketches by three witnesses

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Write down the first picture you see in each optical illusion.

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Review

•Does your nose actually smell?•Does your tongue actually taste?•What is the major organ involved with your senses?•How might neurons be involved in this?

• Remember the terms sensory neurons, interneurons, and motor neurons

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Why didn’t you see more than one picture at first in the optical illusion?

•Your brain is perceiving individual sensory stimuli as a meaningful whole.

29.3 The Senses

Homework

Search the internet for other optical illusions to share tomorrow

Or

Bring in a picture of people (not you) from a magazine, the internet, or an actual photo to share with your table to reenact the “witness” test