1. 12.2 General and Special Senses
Sponge: Set up Cornell Notes on pg. 39 Topic: 12.2 General and Special Senses Essential Question: What is the major difference between General and Special Senses? Text:
12.2 General and Special Senses
2.1 Atoms, Ions, and Molecules
What is the major difference between General and Special Senses?

2. OBJECTIVE
SWBAT understand the differences between General and Special senses and the differences between sensation and perception.

3. Introduction Question
Match Receptor to Sense:
Chemoreceptor
Thermoreceptor
Mechanoreceptor
Photoreceptor
Nociceptor
Senses:
Sight
Touch
Taste
Hearing
Smell

4. Introduction Question
Match Receptor to Sense:
Chemoreceptor
Smell
Taste
Thermoreceptor
Touch
Mechanoreceptor
Hearing
Photoreceptor
Vision
Nociceptor

5. General Senses
Receptors that are widely distributed throughout the body
Ex: Skin, muscles, and joints, viscera (organs and cavities of body)
TOUCH
Bring out the senses worksheet we worked on Monday. We’re going to go over the rest of that today

6. General Senses General senses can be divided into 3 categories:
1) Exteroceptive
Associated with changes at the body’s surface
Ex: Touch, pressure, temperature, pain

7. General Senses 2) Visceroceptive
Associated with changes in viscera (internal organs)
Ex: Blood pressure stretching blood vessels, ingesting a meal

8. General Senses 3) Proprioceptive
Associated with changes in muscles and tendons and in body position
Ex: Knowing body position

9. Special Senses Special Senses:
Specialized receptors whose receptors are located in the complex sensory organs of the head
SMELL/ TASTE/ HEARING/ VISION

10. Sensation and Perception Table Talk:
With your tables, discuss what you believe is the difference between:
Sensation
and
Perception

11. Sensation
A sensation occurs when the brain becomes AWARE of sensory impulses
It is the raw form in which the sensory receptors send information to the brain
Sensation depends on which region of the cerebral cortex receives the impulse
Ex: Impulses reaching the olfactory cortex are ALWAYS sensed as smell

12. Perception
Perception occurs when the brain interprets the sensory impulses.
Person’s view of the stimulus
Help us make sense of our surroundings
The brain organizes the information and translates/interprets it into something meaningful through memories or emotion
Ex: you smell an apple, that’s your sensation, and you then perceive it as an apple.
Ex: you see a cup that’s half full or half empty, but you perceive it as either half full or half empty. Depending on you.

13. Sensations
Projection: While a sensation forms, the brain interprets it to seem to come from the receptors being stimulated.
Allows us to pinpoint the region of stimulation
Ex: See an apple, eye is region stimulated
Ex: Poke your finger, finger is region stimulated

14. Sensory Adaptation Table Talk:
What does it mean to “adapt” to something?
Hypothesize, what is “sensory adaptation”?

15. Sensory Adaptation
Sensory adaptation is the ability to ignore unimportant stimuli or “get used” to it
Otherwise you would be overwhelmed by unimportant information
Involves a decreased response to a particular stimulus from the receptors
Any examples from the class? Taking a hot shower, and after awhile, you don’t realize the temperature of the water.

16. How do your eyes PERCEIVE these optical illusions???