Pressure in turn one of the scala tympani (st) was measured close to the basilar membrane
(bm) and at additional positions as the pressure sensor approached and/or withdrew from
the bm The st pressure measured within about 100 μm of the bm varied rapidly in space at
frequencies around the region's best frequency. Very close to the bm the st pressure was
tuned and scaled nonlinearly with sound level. The scala vestibuli (sv) pressure was
measured at one position close to the stapes within seconds of the st pressure and served …