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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 ?
29.3 The Senses
Objective
• Today you will explain how the
senses detect physical and
chemical stimuli by taking The
Stroop Effect Color Test.
• What is stimuli?
29.3 The Senses
Standard 9.e
• Students know the roles of
sensory neurons, interneurons,
and motor neurons in sensation,
thought, and response.
29.3 The Senses
KEY CONCEPT
The senses detect the internal and external
environments.
Name the
five senses
29.3 The Senses
• 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
29.3 The Senses
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?
29.3 The Senses
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.
29.3 The Senses
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!”
29.3 The Senses
• The ear contributes to hearing.
– Collects vibrations- sound waves- from the air
– How do we rely on hearing?
29.3 The Senses
• Taste and smell are closely related.
– Chemoreceptors detect chemicals dissolved in fluid.
– How do we rely on taste and smell?
29.3 The Senses
• The skin senses touch.
–
–
–
–
detect pressure
detect damaged tissue (pain)
detect temperature
How do we rely on touch
29.3 The Senses
The Stroop Effect Color Test
• Draw two columns on your paper
• Pair up with a person sitting next to you
Column #1
1.
2.
3.
4.
5.
6.
7.
8.
Column #2
29.3 The Senses
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
29.3 The Senses
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
29.3 The Senses
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.
29.3 The Senses
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
29.3 The Senses
How much detail can you remember?
29.3 The Senses
What can you remember?
• 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
29.3 The Senses
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.
29.3 The Senses
3 composite sketches by three witnesses
29.3 The Senses
Write down the first picture
you see in each optical
illusion.
29.3 The Senses
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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
29.3 The Senses
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