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Re: two-tone suppression

Two-tone suppression can also arise from cochlear nonlinearity, as evidenced by mechanical measurements of basilar membrane 2TS (sorry I can't remember the reference), and by measurements of 2TS in otoacoustic emissions (e.g. Brass and Kemp, Suppression of stimulus frequency otoacoustic emissions, J Acoust Soc Am. 1993 Feb;93(2):920-39). 

Put simply, the suppressor tone drives the cochlear amplifier into saturation, so that its response to the probe tone is reduced.


>>> Martin Braun <nombraun@xxxxxxxxx> 21/09/2005 14:47 >>>
Monita Chatterjee asked:

> What is the latest on an explanation/model for two-tone suppression?

These papers may be of use:

Webster, W.R., Servieére, J., Martin, R., Brown, M., 1985. Uncrossed
and crossed inhibition in the inferior colliculus of the cat: A combined
2-deoxyglucose and electrophysiological study. J. Neurosci. 5, 1820-1832.

Palombi, P.S., Caspary, D.M., 1996. GABA inputs control discharge
rate primarily within frequency receptive fields of inferior colliculus
neurons. J. Neurophysiol. 75, 2211-2219.

Caspary, D.M., Helfert, R.H., Palombi, P.S., 1997. The role of
GABA in shaping frequency response properties in the chinchilla
inferior colliculus. In: Syka, J. (Ed.), Acoustic Signal Processing in
the Central Auditory System. Plenum Press, New York, pp. 227-238.



Martin Braun
Neuroscience of Music
S-671 95 Klässbol
web site: http://w1.570.telia.com/~u57011259/index.htm