PSYCHOLOGY, Ninth Edition in Modules David Myers

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Hearing (Do you hear what I hear?)

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PSYCHOLOGY, Ninth Edition in Modules David Myers PowerPoint Slides Aneeq Ahmad Henderson State University Worth Publishers, © 2010

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

Hearing The Stimulus Input: Sound Waves Sound waves are compressing and expanding air molecules. Preview Question 1: What are the characteristics of air pressure waves that we hear as sound?

Sound Characteristics Frequency (pitch) Intensity (loudness)

The Ear Dr. Fred Hossler/ Visuals Unlimited Preview Question 2: How does the ear transform sound energy into neural messages?

The Ear Outer Ear: Collects and sends sounds to the eardrum. 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.

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

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

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

Frequency (Pitch) Frequency (pitch): The dimension of frequency determined by the wavelength of sound. Wavelength: The distance from the peak of one wave to the peak of the next. Preview Question 3: What theories help us understand pitch perception?

Localization of Sounds Because we have two ears, sounds that reach one ear faster than the other ear cause us to localize the sound. Preview Question 4: How do we locate sounds?

1. Intensity differences Localization of Sound 1. Intensity differences 2. Time differences Time differences as small as 1/100,000 of a second can cause us to localize sound. The head acts as a “shadow” or partial sound barrier. Preview Question 5: What are the common causes of hearing loss, and why does controversy surround cochlear implants?