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Re: AUDITORY Digest - 24 May 2007 to 25 May 2007 (#2007-115)

There were several suggestions in response to my question. Thank you
again. I am posting a compilation below. Trying to understand this leads
me to some comments and a question:

For speech and speech-like stimuli there appears to be an effect of high
freq HL (hearing loss) on perception at low-frequencies.
Because of reorganization, there is an improvement of the discrimination
of frequencies at the edge of the hearing loss (but how far does this
There may be a global change is loudness sensitivity (gain?) due to high
freq HL.
There may be a global change in ITD thresholds.

Question: Would the perception of low freq simple stimuli (say pure tone
at 1 KHz) be affected by high freq HL beginning at 8+ KHz and in what
manner? Other non-speech but more complex stimuli like combinations of
narrow-band FM sweeps?


Fatima Husain, Ph.D.


1] From Ben Hornsby
Horwitz, A. R., J. R. Dubno, et al. (2002). "Recognition of
low-pass-filtered consonants in noise with normal and impaired
high-frequency hearing." J Acoust Soc Am 111(1 Pt 1): 409-16.

F. Husain: See also comment by Strickland et al. 2004, JASA, 116(1) on the
above paper. They disagree with Horwitz et al.?s study
findings/conclusions. They say ?high-CF fibers not necessary for normal
speech perception.?

2] From Christian Lorenzi
you may have a look at Horwitz et al.'s (very well conducted) work on this
Horwitz, A.R., Dubno, J.R. & Ahlstrom, J.B. J. Acoust. Soc. Am. 111,
409-416 (2002).

He also sent his ARO 2007 poster on ?perception of temporal fine structure
cues also reveals the presence of deficits in temporal perception in this
low-frequency region?.

3] From Arnaud Norena
hearing loss (and the related plastic changes) has been shown to be
associated with an improvement of frequency discrimination at the cut-off
frequency of the hearing loss (McDermott et al., 1998; Thai-van et al.,
2002, 2003, 2007 - in press; Kluk and Moore, 2006).
On the other hand, it seems that a hearing loss confined to high
frequencies could induce a global increase in auditory hypersensitivity
(hyperacusis). We have a paper in press (Norena & Chery-Croze, 2007), but
see also the interesting study of Formby et al (2003).

4] From Laurent Demany
Lacher-Fougere and Demany (JASA, 2005, 118, page 2519-2526) wrote:
"... our data confirm previous evidence (Hawkins and Wightman, 1980;
Smoski and Trahiotis, 1986) that, in listeners with bilateral cochlear
hearing losses at high frequencies but normal absolute thresholds at low
frequencies, the ITD threshold at low frequencies may be abnormally
large." (p. 2523).

5] From Emery Ku  (I haven?t read this one yet)
Harris, FP. Distortion Product Ototacoustic emissions in humans with high
frequency sensorineural hearing loss. JSHR, vol 33, 1990.

6] a review article
Salvi, RJ et al. Auditory plasticity and hyperactivity following cochlear
damage. Hearing Research, vol 147, 2000