Re: chop, chop, chop...Timbre

Hi Sarn.

Some interesting web site refs on hearing:

http://www.robinsonresearch.com/HEALTH/ANATOMY/hearing.htm
makes distinction of telephone theory and resonance theory.

More about it here:
http://psychclassics.yorku.ca/Baldwin/Dictionary/H1defs.htm

"
Functions. Helmholtz early adopted a resonance theory of audition, and was first attracted to the
rods of Corti as the possible resonators by which tones are analysed in the ear. The fact that they
are not present in birds, and, further, that they are practically all the same length, size, and
shape, led him to abandon them. He next fixed upon the fibres of the basilar membrane. These
increase gradually in length from base to apex of the cochlea, and thus satisfy one of the
requirements of the theory. Ayers maintains that the fibres of the basilar membrane are inadequate
on account of their number, their physical constitution, and their arrangement with reference to the
sensory cells, and he advances the theory that the hairs of the sensory cells are the only
structures present that can properly act as resonators. The objection that the hairs are too short
and too nearly the same length no longer holds, if we accept Ayers' results; and in this way the
number of resonators is greatly increased, from 24,000 fibres of the basilar membrane to, according
to Ayers' estimate, 385,000 sensory hairs.

Another theory that is gaining in prominence is the appropriately named 'telephone theory' of
Rutherford. According to this the organ of Corti vibrates as a whole, giving to the auditory nerve
the same number of stimuli as there are movements of the tympanic membrane and stapes, and these
stimuli are analysed by the auditory centres in the brain. See AUDITORY SENSATION below in this
article (III).
"

Robert

Robert, this information is exactly 100 years out of date!

-----Original Message-----
From: Robert Walker [mailto:robert_walker@rcwalker.freeserve.co.uk]
Sent: Friday, April 06, 2001 2:12 PM
To: tuning@yahoogroups.com
Subject: [tuning] Re: chop, chop, chop...Timbre

Hi Sarn.

Some interesting web site refs on hearing:

http://www.robinsonresearch.com/HEALTH/ANATOMY/hearing.htm
<http://www.robinsonresearch.com/HEALTH/ANATOMY/hearing.htm>
makes distinction of telephone theory and resonance theory.

More about it here:
http://psychclassics.yorku.ca/Baldwin/Dictionary/H1defs.htm
<http://psychclassics.yorku.ca/Baldwin/Dictionary/H1defs.htm>

"
Functions. Helmholtz early adopted a resonance theory of audition, and was
first attracted to the
rods of Corti as the possible resonators by which tones are analysed in the
ear. The fact that they
are not present in birds, and, further, that they are practically all the
same length, size, and
shape, led him to abandon them. He next fixed upon the fibres of the basilar
membrane. These
increase gradually in length from base to apex of the cochlea, and thus
satisfy one of the
requirements of the theory. Ayers maintains that the fibres of the basilar
membrane are inadequate
on account of their number, their physical constitution, and their
arrangement with reference to the
sensory cells, and he advances the theory that the hairs of the sensory
cells are the only
structures present that can properly act as resonators. The objection that
the hairs are too short
and too nearly the same length no longer holds, if we accept Ayers' results;
and in this way the
number of resonators is greatly increased, from 24,000 fibres of the basilar
membrane to, according
to Ayers' estimate, 385,000 sensory hairs.

Another theory that is gaining in prominence is the appropriately named
'telephone theory' of
Rutherford. According to this the organ of Corti vibrates as a whole, giving
to the auditory nerve
the same number of stimuli as there are movements of the tympanic membrane
and stapes, and these
stimuli are analysed by the auditory centres in the brain. See AUDITORY
SENSATION below in this
article (III).
"

Robert

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Hi Paul,

> Robert, this information is exactly 100 years out of date!

Sorry!

Robert