A critical band spans roughly 1.3 mm, some 145 hair cells wide.

Evidence

The width of the critical band corresponds to a distance along the basilar membrane of about 1.3 mm. Assuming that the abutting haircells have a distance of about 9 Ilm along the whole length of the 32 mm basilar membrane, the total number of 3600 haircells in one row from helicotrema to oval window is achieved. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 930

Categorization

• CANDY: The concrete arithmetic tidbit: critical bandwidth lines up with about 145 hair cells in a row along the basilar membrane.