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discrimination of loud low frequencies

Dear List

Can anyone tell me if there is any experimental data to suggest that there
may be something peculiar in the discrimination of loud low frequency tones,
between about 50 Hz and 800 Hz, and above about 90 dB SPL? For example, is it
the case that either intensity and/or frequency discrimination gets better
above about 90/100 dB SPL for low frequencies, but not for tones of say 2 kHz or
above? In other words, is there any evidence of a mechanism that cuts in
for loud low frequencies (other than normal phase-locking)?

Any comments/references gratefully received.


Neil Todd