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Figure 4: Representative example of a map for a noise - induced hearing loss subject. Panels (a) Distortion product otoacoustic emission (DPOAE) level map at L1,L2 = 65,55 dB SPL; (b) DPOAE signal - to - noise ratio (SNR) map at L1,L2 = 65,55 dB SPL; (c) DPOAE level map at L1,L2 = 75,75 dB SPL; (d) DPOAE SNR map at L1,L2 = 75,75 dB SPL. Audiometric pure - tone air conducted thresholds were less than 5 dBHL for 250 - 2000 Hz, 45 dBHL at 3000 Hz, 50 dBHL at 4000 Hz, 40 dBHL for 6000 Hz and 20 dBHL at 8000 Hz

Figure 4: Representative example of a map for a noise - induced hearing loss subject. Panels (a) Distortion product otoacoustic emission (DPOAE) level map at L1,L2 = 65,55 dB SPL; (b) DPOAE signal - to - noise ratio (SNR) map at L1,L2 = 65,55 dB SPL; (c) DPOAE level map at L1,L2 = 75,75 dB SPL; (d) DPOAE SNR map at L1,L2 = 75,75 dB SPL. Audiometric pure - tone air conducted thresholds were less than 5 dBHL for 250 - 2000 Hz, 45 dBHL at 3000 Hz, 50 dBHL at 4000 Hz, 40 dBHL for 6000 Hz and 20 dBHL at 8000 Hz