Intracochlear pressure was measured in vivo in the base of the gerbil cochlea. The
measurements were made over a wide range of frequencies simultaneously in scalae
vestibuli and tympani. Pressure was measured just adjacent to the stapes in scala vestibuli
and at a number of positions spaced by tens of micrometers, including a position within
several micrometers of the basilar membrane, in scala tympani. Two findings emerged from
the basic results. First, the spatial variation in scala tympani pressure indicated that the …