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For CFs \u22643 kHz, the lower limbs of tuning curves have similar slopes, about \u221218 dB\/octave, but the upper limbs have slopes that become increasingly steep with increasing frequency and CF. For CFs &gt;4 kHz, tuning curves normalized to the CF are nearly identical and consist of three segments. A tip segment, within 30\u201340 dB of CF threshold, has lower- and upper-limb slopes of \u221260 and +120 dB\/octave, respectively, and is flanked by a low-frequency (\u201ctail\u201d) segment, with shallow slope, and a terminal high-frequency segment with very steep slope (several hundreds of dB\/octave). The tuning curves of fibers innervating basal cochlear sites closely resemble basilar-membrane tuning curves computed with low isovelocity criteria. At the apex of the chinchilla cochlea, frequency tuning is substantially sharper for ANFs than for available recordings of organ of Corti vibrations.<\/jats:p>","DOI":"10.1152\/jn.90637.2008","type":"journal-article","created":{"date-parts":[[2008,8,14]],"date-time":"2008-08-14T01:45:15Z","timestamp":1218678315000},"page":"2889-2898","source":"Crossref","is-referenced-by-count":85,"title":["Threshold Tuning Curves of Chinchilla Auditory-Nerve Fibers. I. 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