1. Chapter 8 sec.2 The Senses

2. Vision Most studied of all senses Most studied of all senses How does vision Work? How does vision Work?

3. Light enters thorough pupil, reaches lens. Focus light on retina, then the cones and rods turn light into neural impulses that travel to the brain an then the optic nerve.

4. Cones and Rods Cones-daylight vision Cones-daylight vision Rods-night vision Rods-night vision Color deficiency Color deficiency Affects 8% of American males and 1 % of American females, women carry the gene Affects 8% of American males and 1 % of American females, women carry the gene

6. How do We See Light? Different wavelengths produce the colors we see Different wavelengths produce the colors we see

7. Binocular Vision The size a known object has on your retina - If you have knowledge of the size of an object from previous experience, then your brain can gauge the distance based on the size of the object on the retina. The size a known object has on your retina - If you have knowledge of the size of an object from previous experience, then your brain can gauge the distance based on the size of the object on the retina.

8. Binocular Vision Cont. Moving parallax - When you move your head from side to side, objects that are close to you move rapidly across your retina. However, objects that are far away move very little. In this way, your brain can tell roughly how far something is from you. Moving parallax - When you move your head from side to side, objects that are close to you move rapidly across your retina. However, objects that are far away move very little. In this way, your brain can tell roughly how far something is from you. Stereo vision - Each eye receives a different image of an object on its retina because each eye is about 2 inches apart. This is especially true when an object is close to your eyes. This is less useful when objects are far away because the images on the retina become more identical the farther they are from your eyes. Stereo vision - Each eye receives a different image of an object on its retina because each eye is about 2 inches apart. This is especially true when an object is close to your eyes. This is less useful when objects are far away because the images on the retina become more identical the farther they are from your eyes.

9. Hearing Vibrations in the air produces sound waves and that we hear Vibrations in the air produces sound waves and that we hear Higher the amplitude louder the sound Higher the amplitude louder the sound Pathway of Sound Pathway of Sound Cochlea transforms sound into usable signal which is sent to the brain Cochlea transforms sound into usable signal which is sent to the brain

11. Deafness Conventional Deafness-small damage fixable w/hearing aids Conventional Deafness-small damage fixable w/hearing aids Sensor neural Deafness-damage to Cochlea, fixable only by a Cochlea implant Sensor neural Deafness-damage to Cochlea, fixable only by a Cochlea implant

12. Smell and Taste Known as your chemical sense Known as your chemical sense Smell receptors located in your nose Smell receptors located in your nose Read taste, texture and temperature Read taste, texture and temperature

13. Main Tastes SOUR, SLATY, BITTER, SWEET

14. Skin Senses More receptors you have on your skin, more feeling you will get More receptors you have on your skin, more feeling you will get Warm/Cold-must be greater or less than skin Warm/Cold-must be greater or less than skin Pain-prevents damage to your body Pain-prevents damage to your body