1. Hearing

2. The Stimulus Input: Sound Waves
Audition
Amplitude
loudness
Frequency
Pitch

3. The Ear
Outer ear
Auditory canal
Ear drum

4. The structure of the ear
The ear is divided into the outer, middle and inner ear.

5. The structure of the ear
The sound waves travel down the auditory canal to the eardrum.

6. The structure of the ear
Eardrum = tight membrane that vibrates when struck by sound waves.

7. The structure of the ear
Eardrum

8. The Ear
Middle ear
Hammer, anvil, stirrup

9. The structure of the ear
Bones of the middle ear = the hammer, anvil, stirrup which vibrate with the eardrum.

10. The structure of the ear
Hammer

11. The structure of the ear
Anvil

12. The structure of the ear
Stirrup

13. The structure of the ear
Oval window = where the stirrup connects to the cochlea.

14. The structure of the ear
Cochlea = a coiled, bony, fluid-filled tube in the inner ear through which sound waves trigger nerve impulses.

15. The Ear Inner ear Oval window Cochlea Auditory nerve Auditory cortex
Basilar membrane
Auditory nerve
Auditory cortex

16. The structure of the ear
Oval Window

17. The structure of the ear
Cochlea

18. The structure of the ear
Fluid in the cochlea

19. The structure of the ear
Hair cells in the cochlea

20. The structure of the ear
Auditory nerve = nerve which sends the auditory message to the brain via the thalamus.

21. The structure of the ear
Nerve fibers

22. The structure of the ear
Auditory nerve

23. Neural impulse to the brain

24. The Ear Perceiving Loudness
Basilar membrane’s hair cells
Compressed sound

25. Cochlea and loud sounds

26. The Ear Perceiving Pitch
Place theory
High pitched sounds
Frequency theory
Low pitched sounds
Volley principle

27. The Ear Locating Sounds
Stereophonic hearing
Localization of sounds
Intensity
Speed of the sound

28. Hearing Loss and Deaf Culture
Conduction hearing loss
Sensorineural hearing loss
Cochlea implant
Signing