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: 441-443 12.2 General and Special Senses 2.1 Atoms, Ions, and Molecules What is the major difference between General and Special Senses?

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

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

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

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

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

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

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

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

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

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

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.

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

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

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.

How do your eyes PERCEIVE these optical illusions???