Subject: Re: AUDITORY Digest - 1 Aug 2002 to 4 Aug 2002 (#2002-120) From: Jont Allen <jba(at)auditorymodels.org> Date: Tue, 6 Aug 2002 23:45:14 +0200The engineer, and everyone else, should read a very famous paper by Wegel (of bell labs fame), that deals exactly with these issues. Wegel published the first hearing thresholds with Harvey Fletcher, and worked for T. A. Edison, it is said. (at)article{Wegel31 ,author={Wegel, R.L.} ,title={Study of tinnitus} ,journal="Archives Otolaryngology" ,year=1931 ,month=aug ,volume=14 ,pages={158-165} } Jont Allen Automatic digest processor wrote: >There are 2 messages totalling 76 lines in this issue. > >Topics of the day: > > 1. Objective tinnitus due to high-level SOAE (2) > >---------------------------------------------------------------------- > >Date: Sun, 4 Aug 2002 12:27:26 +0200 >From: Martin Braun <nombraun(at)POST.NETLINK.SE> >Subject: Objective tinnitus due to high-level SOAE > >A question on otoacoustic emissions and tinnitus: > >A 31-year-old electrical engineer wrote to me and asked for help. One year >ago he had a sudden hearing loss in his right ear. Hearing was back to >normal after four weeks, but during this recovery period he had developed a >strong tonal tinnitus in this ear. He was able to compare the pitch of this >tone with an adjustable tone from a tone generator. The ear's tone turned >out to be a sinetone of 1042 Hz. > >Later he was also able to hear the tone by his left ear when he connected >both ears via a thin tube. After that he also recorded the tone by a >microphone in the ear canal of his right ear. Finally a high-level >spontaneous otoacoustic emission (SOAE) at 1042 Hz was established >audiologically. The level was given as +22 dB, but I am not sure how >reliable this figure is. He wrote that where he lives even the best clinic >never had a similar case and does not know how to help him. > >The problem is that in recent months he had the impression that the tone had >become louder and louder. It is unkown if there has been an objective >increase in SOAE level, but he perceives the tone as being much louder now. >He has come to a point of desperation now, and he would accept even >destructive surgical measures just to get rid of this tone. > >Question: >It is known that SOAEs can be suppressed by outside sinetones applied to the >ear. What is the experience with suppressing high-level SOAEs? Is it >possible? If yes, how is it done best, and which equipment would this >patient need? > >Martin > >------------------------------------------- >Martin Braun >Neuroscience of Music >S-671 95 Klässbol >Sweden >e-mail: nombraun(at)post.netlink.se >web site: http://hem.netlink.se/~sbe29751/home.htm > >------------------------------ > >Date: Sun, 4 Aug 2002 05:45:15 -0500 >From: Thomas G Brennan <g_brennantg(at)TITAN.SFASU.EDU> >Subject: Re: Objective tinnitus due to high-level SOAE > >Martin, this will require a specializing audiologist. The first thing which >will need to be done is that variable tone generation equipment will be >necessary to see if masking can help in this situation. Being able to alter >signal phase may also be useful. Generally, single tinal tinnitus does better >with a masker. If it can be determined that masking can indeed help this >gentleman, a tinnitus masker can be used. MMM, Starkey, and several other >companies make these. However, you cannot generally return them after purchase >so it is important to determin usefulness before the fact. Another issue is >that the frequency of the tone may change with time and there may eventually be >more than a single tone. This largely depends upon the cause of the problem. >If I was just to guess, I might suspect something viral in a case like this as >an initial start. > >Tom > > >Tom Brennan, CCC-A/SLP, RHD >web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html > >------------------------------ > >End of AUDITORY Digest - 1 Aug 2002 to 4 Aug 2002 (#2002-120) >************************************************************* > -- Jont B. Allen, jba(at)auditorymodels.org; 908/654-1274voice; 908/789-9575 fax 382 Forest Hill Way Mountainside NJ 07092 http://auditorymodels.org/jba ``It is hard to abandon the feeling that the unfamiliar is absurd and illogical.'' --G.A. Miller, p. 5 of his book `Language and communication'