38 Hearing and Psychological Effects S. Akishita

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Ritsumeikan University

38.1 Introduction .......................................................................... 38-1

38.2 Structure and Function of the Ear ...................................... 38-1

38.3 Frequency and Loudness Response ..................................... 38-2

38.4 Hearing Loss ......................................................................... 38-4

38.5 Psychological Effects of Noise ............................................. 38-4

Loudness Interpretation † Noise-Criteria Curves † Sound Level

Summary

In this chapter, first the characteristics of human hearing are discussed, including a brief description of the anatomy

and function of the hearing mechanisms. Next, the frequency and loudness responses of the human hearing are

explained, and then hearing loss causing permanent damage is described. Finally, the psychological response to

noise is discussed by defining the indices, loudness (sones), noise-criteria curves, and sound level.

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