The width of the basilar membrane in the guinea pig.

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Abstract
"The width of the basilar membrane was measured in 10 guinea pig cochleas, using as a reference point the distance from the basal end. The measurements indicate a rapidly increasing but widely deviating 'beginning' portion, followed by a deceleration in rate of change before the third half-turn; a slight spurt after the third half-turn; a 'middle' portion of slight but definite progression with relatively little deviation; another deceleration in the approach to the fifth half-turn; a rapid and deviating increase to the maximum point; and an even greater deviation and hurried decline after the maximum point, which was reached about three-fourths to a full turn before the apical end. The average value of the maximum points measured was 228 micra. Using Guild's figure of 0.062 mm. as the average minimum for the extreme basal portion, there is a range of 3 2/3 times in width. Theories of hearing which place emphasis on the width of the membrane as a differentiating mechanism must allow for the many variations indicated." (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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