Spontaneous otoacoustic emissions show a minimum frequency spacing that grows with frequency

Evidence

Searches for the number of emissions produced in single subjects using very sensitive microphones indicate that the number of emissions does not increase with increasing resolution: rather it seems that the frequency separation between neighbouring emissions does not decrease below a certain value. A careful analysis of the frequency separation between the neighbouring emissions of many subjects indicates that this distance increases with frequency. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 251

Categorization

• QUESTION: This suggests an underlying place-based mechanism on the basilar membrane — emissions correspond to fixed cochlear locations. Could tie into tonotopic organization models.
• corroborated: 2 independent passages support this claim — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 251