Sponge: Set up Cornell Notes
on pg. 41
Topic:
12.1 General and Special
Senses
Essential Question:
1. What is the major
difference between
General and Special
Senses?
12.1 General and Special Senses
2.1 Atoms, Ions,
and Molecules
Pg. 40
1. Name your 5 senses.
2. There are two types of senses, general
senses and special senses, hypothesize
which of the 5 senses belong in each
category.
General Senses
General Senses are those with receptors that are
widely distributed throughout the body
Ex: Skin, various organs, muscles, and joints,
viscera
3
Which of the 5 sensory receptors goes
with each type of general sense?
• Touch/Pressure
• Mechanoreceptors
• Temperature
• Thermoreceptors
• Pain
• Pain receptors
General Senses
General Senses can be divided into three groups:
• Exteroceptive senses – senses associated with changes at
the body surface
• Ex: touch, pressure, temperature, pain
• Visceroceptive senses – senses associated with changes in
viscera (internal organs)
• Ex: blood pressure stretching blood vessels, ingesting a
meal
• Proprioceptive senses – senses associated with changes in
muscles and tendons and in body position
5
Special Senses
Special Senses have more specialized receptors
whose receptors are located in the complex sensory
organs of the head
Based on their
location, hypothesize
which senses are
“special senses”
6
Which type of receptor goes with each
type of special sense?
• Smell
• Chemoreceptors (olfactory receptors)
• Taste
• Chemoreceptors
(taste cells aka gustatory cells-located in taste buds)
• Hearing
• Mechanoreceptors (hair cells)
• Vision
• Photoreceptors (rods and cones)
Special and General Senses (5m25s)
Pg. 40 • Take 3-5 bullets about each
sense
•
•
•
•
•
Vision
Hearing
Taste
Smell
Touch
(Video in this order)
All senses work basically the same way:
• Sensory receptors stimulate neurons to send
impulses along sensory fibers to the brain
• There the cerebral cortex forms a “perception”
In your own words…
Pg. 40
Explain what you think the difference is
between
Sensation
and
Perception
.
10
Senses
Sensation is a feeling that occurs when brain becomes
aware of sensory impulse based on new experiences or
recalled memory
• The resulting sensation depends on which region of the
cerebral cortex receives the impulse
A pleasant
sound
Ex: a soft
Touch
Small black
lines
11
Sensations
Projection is a process in which the brain projects the
sensation back to the apparent source
• It allows a person to pinpoint the region of stimulation
• Exs:
• The eyes see an apple
• The nose smells an apple
• The ears hear the crunch as we bite into an apple
12
Senses
Perception is a person’s view of the stimulus; the way
the brain interprets the information
Classical
music
playing
Ex: the feel
of a hand
Letters on an
eye chart
13
Pathways From Sensation to Perception
(Example of an Apple)
Pg 40
14
Let’s take a look at how
your brain “perceives” these
optical illusions.
Write down the first picture
you see.
Pushing the Limits: Sensation (8m 11s)