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Lecture

May 29_Audition Speech Production.docx


Department
Psychology
Course Code
PSYC 367
Professor
James Hyman

Page:
of 7
I. Physiology of Hearing:
1. Basics of Sound:
Sound waves are pressure fluctuations 波动 in air molecules:
Sound waves are described by the frequency(pitch, Hz) and amplitude
振幅
(loudness/intensity, dB
分贝
) of pressure fluctuation; Complexity(timbre
音色
):
Lateral line:
sensory organs in fishes;
made of nerve fibres
(cell hairs) wrapped in
jellylike stuff that bends
in response to water
displacement; serves to
detect movements and
pressure changes in the
surrounding waterhow
close, big, at front or back
the fishes around are.
Frequency:
speed of the fish;
Amplitude: size of the
fish
Human hearing
frequency: 2020,000
Hz
Audibility curve: there’s a relationship between the different frequency you
hear and how loud the sound that will allow you to hear.
Sound of 400-6,000 Hz can be heard by very low
amplitude/loudnessour hearing is most sensitive to the range of
frequency of human speech.
2. The Auditory System:
Earoverall view
Outer, Middle, and Inner Ear
Outer Ear:
1) Pinna: Normally in mammals; Come in different sizes and purpose
(e.g. Elephant’s big pinna help to cool down the blood, radiate heat);
to collect and slightly amplify sound waves, and to aid in auditory
localization. The pinna directs sound waves into the auditory canal
2) Auditory Canal: The auditory canal funnels sound waves from the
pinna to the tympanic membrane