1 PSYCHOLOGY (8th Edition, in Modules) David Myers PowerPoint Slides Aneeq Ahmad Henderson State University Worth Publishers, © 2007.

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Presentation transcript:

1 PSYCHOLOGY (8th Edition, in Modules) David Myers PowerPoint Slides Aneeq Ahmad Henderson State University Worth Publishers, © 2007

2 Hearing Module 14

3 Hearing  The Stimulus Input: Sound Waves  The Ear  Hearing Loss and Deaf Culture

4 The Stimulus Input: Sound Waves Sound waves are composed of compression and rarefaction of air molecules. Acoustical transduction: Conversion of sound waves into neural impulses in the hairs cells of the inner ear.

5 Sound Characteristics 1.Frequency (pitch) 2.Intensity (loudness) 3.Quality (timbre)

6 Frequency (Pitch) Frequency (pitch): Dimension of frequency determined by wavelength of sound. Wavelength: The distance from the peak of one wave to the peak of the next.

7 Intensity (Loudness) Intensity (Loudness): Amount of energy in a wave determined by amplitude relates to perceived loudness.

8 Loudness of Sound 70dB 120dB Richard Kaylin/ Stone/ Getty Images

9 Quality (Timbre) Quality (Timbre): Characteristics of sound from a zither and a guitar allows the ear to distinguish between the two. Zither Guitar

10 Overtones Overtones: Make the distinction among musical instruments possible.

11 The Ear Dr. Fred Hossler/ Visuals Unlimited

12 The Ear Outer Ear: Pinna. Collects sounds. Middle Ear: Chamber between eardrum and cochlea containing three tiny bones (hammer, anvil, stirrup) that concentrate the vibrations of the eardrum on the cochlea’s oval window. Inner Ear: Innermost part of the ear, containing the cochlea, semicircular canals, and vestibular sacs.

13 Cochlea Cochlea: Coiled, bony, fluid-filled tube in the inner ear that transduces sound vibrations to auditory signals.

14 Theories of Audition Place Theory suggests that sound frequencies stimulate basilar membrane at specific places resulting in perceived pitch.

15 Theories of Audition Frequency Theory states that the rate of nerve impulses traveling up the auditory nerve matches the frequency of a tone, thus enabling us to sense its pitch. Sound Frequency Auditory Nerve Action Potentials 100 Hz 200 Hz

16 Localization of Sounds Because we have two ears sounds that reach one ear faster than the other makes us localize the sound.

17 Localization of Sound 1. Intensity differences 2. Time differences Time differences as small as 1/100,000 of a second can lead to localize sound. Head acts as “shadow” or partial sound barrier.

18 Hearing Loss Conduction Hearing Loss: Hearing loss caused by damage to the mechanical system that conducts sound waves to the cochlea. Sensorineural Hearing Loss: Hearing loss caused by damage to the cochlea’s receptor cells or to the auditory nerve, also called nerve deafness.

19 Hearing Deficits Older people tend to hear low frequencies well but suffer hearing loss for high frequencies.

20 Deaf Culture Cochlear implants are electronic devices that enable the brain to hear sounds. Cochlear ImplantDeaf Musician EG Images/ J.S. Wilson © Wolfgang Gstottner. (2004) American Scientist, Vol. 92, Number 5. (p. 437)