1. SENSES
Sensory Receptors - detect environmental changes and trigger nerve impulses
- somatic senses (touch, pressure, temp, pain) - special senses (smell, taste, vision, equilibrium, hearing)

2. Receptors 1. Chemoreceptors = chemical 2. Pain receptors = pain
3. Thermoreceptors = heat
4. Mechanoreceptors = pressure, location
5. Photoreceptors = light

3. Sensations What do you think is going on in this picture?
Sensation = feeling that occurs when a brain interprets a sensory impulse
Projection = process where the cerebral cortex causes a feeling to stem from a source (eyes, ears)
Sensory adaptation = sensory receptors stop sending signals when they are repeatedly stimulated
What do you think is going on in this picture?
Sensory Deprivation is a technique initially used by neuro-psychiatrists designed to deliberately reduce or completely remove stimuli from one or all of the senses.

4. Rank the pain from least to worst.
Stubbed toe
Burn from stove
Slamming finger in a door
Paper cut
Sprained ankle
Sore throat
Sore muscles

5. Regulation of Pain
Inhibitors of Pain (natural brain chemicals can be mimicked by drugs such as morphine)
Enkephalins Serotonin Endorphins

7. Special Senses Olfactory (smell) Gustatory (taste)
Hearing & Equilibrium
Sight

8. Sense of Smell (Olfactory)
Odor --> Receptor Cell  -->  Olfactory bulb --> Olfactory Tract 
--> LIMBIC SYSTEM
Why do cells trigger memories?

10. Sense of Taste (Gustatory)
Papillae = taste buds

11. Sense of Hearing External Ear Auricle (pinna) - outer ear
External Auditory Meatus
- opening to the eardrum

13. Sense of Equilibrium
Static Equilibrium - maintain stability and posture
Dynamic Equilibrium - balance during sudden movement
Cerebellum - interprets impulses from the semicircular canals and maintains overall balance
Walking on two legs is harder than you think…
Robot Fails

14. Figure 16.7a

15. Light Refraction Light bends around objects
Images viewed by the eye are upside down

16. We have difficulty interpreting images that are upside down
Which one is the real mona lisa?