When it comes to noise scales, Köseolu says, "Noise between 1-5 kHz is the most harmful group for hearing; Scale A, medium frequency noises are Scale B, and high-frequency noises are Scale C, and Scale B and C noises are less harmful to hearing."
Noise losses can be classified clinically as Temporary Threshold Shift (TTS), Asymptotic Threshold Shift (ATS), and Permanent Threshold Shift (PTS). Temporary Threshold Shift (TTS). It's a sensorineural hearing loss that goes away after 24 hours of rest and returns to normal. It occurs as a result of the organ of Corti's decreased mechanical sensitivity caused by the temporary closure of the mechano-electrical transduction channels of the outer hair cells.
Temporary Threshold Shift occurs first and resolves at rest. However, as long as the person is exposed to the same noise, the loss does not improve with rest. This is called “Permanent Threshold Shift”.Asymptotic Threshold Shift is the highest degree of hearing loss in people exposed to noise. After a while, exposure to noise does not increase hearing loss. This point is the upper limit of the PTS. This point is called the ATS.
The characteristics of noise-induced hearing loss were discussed. "Because of the frequency's vibration feature, the basal fold, which is narrow and stiff, is shaken more." The sound is best transmitted to the inner ear at 4000 Hz due to the unique resonances of the DHF and middle ear structures. The first 4000 Hz frequency is affected by hearing loss." According to the Legal Legislation, in order for noise damage to be considered an "occupational disease"; It is necessary to work at least two years in noisy work, and at least 30 days in jobs with a noise intensity of 85 dB continuously.
Finally, the biological and psychological effects of noise exposure were discussed. The Audiology Department's lecturers and students attended the seminar, and at the end of the presentation, the productive seminar concluded with their contributions to the subject and thanks for the presentation.
