1. How we Hear

3. Auditory transduction http://www.youtube.com/watch?v=PeTriGTEN oc http://www.youtube.com/watch?v=PeTriGTEN oc

4. Hair cells

5. Stereocilia Organelle Converts the mechanical energy into chemical energy  action potential

6. transduction

8. Sound Travels at 760 miles/hour – depends on temp and humidity. One mile? Pitch Loudness Timbre

9. Pitch frequency (wavelength) – inverse relationship

10. Different groups of hair cells responsible for different frequencies Healthy human ear can hear frequencies ranging from 20 Hz to 20,000 Hz

11. Audiogram

12. Loudness Results from the difference in pressure between the compressed areas and the rarefied areas of the wave. Greater difference = louder

13. Damage to hair cells

14. In 2001, 5.2 million children (6-19) suffered from noise-induced hearing loss Listening to music on earphones at max level for 15 minutes per day is enough to cause permanent damage