Re: Unilateral hearing loss ("Dr. Harriet Jacobster" )


Subject: Re: Unilateral hearing loss
From:    "Dr. Harriet Jacobster"  <hjacobster@xxxxxxxx>
Date:    Thu, 14 Apr 2011 12:45:29 -0400
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

----------MB_8CDC8DA7F648C68_F1C_1AAE9_webmail-d146.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="us-ascii" Anecdotally speaking, it's not just the head muffle effect, but also the= proximity of the barrel recoil to the left ear in RH shooters. But I try= not to make these generalizations and tend more to ask my patients to sim= ulate how they hold their rifles and shoot.=20 As for Auditory processing, I can't cite anything right now off the top of= my head, but your friend may possibly be referring to the Right Ear Advan= tage and the maturity of the corpus callosum. In younger children and you= ng adults (up to around 12 years or so), there is a greater difference in= how the left ear and right ear "process" information due more to the imma= turity of the CC. However, this difference should resolve as the person= matures and the pathways are more developed.=20 =20 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=20 Harriet B. Jacobster, Au.D., CCC-A, FAAA=20 ASHA Certified in Audiology=20 hjacobster@xxxxxxxx =20 =20 -----Original Message----- From: Mark Shaver <mdshaver@xxxxxxxx> To: AUDITORY@xxxxxxxx Sent: Thu, Apr 14, 2011 10:56 am Subject: Re: Unilateral hearing loss Shooting for right-handers may increase the magnitude fo= r the ear effect but I believe it is also present when noise exposure= is not known to be more pronounced on either side (Chung et al., = 1983). It may be worth noting that there are asymmetries in olivococh= lear function which others have suggested may relate to protection from= noise. However, if I remember correctly these asymmetries were demonst= rated in humans using contralateral suppression of TEOAEs which is repr= esentative of medial olivocochlear function. However, it seems that the= lateral olivocochlear bundle is a better candidate for aiding in prote= ction against noise. =20 =20 =20 Mark =20 =20 =20 =20 Mark Shaver, PhD, CCC-A =20 Clinical Educator/Audiologist =20 Wichita State University =20 Evelyn Hendren Cassat Speech-Language-Hearing Clinic =20 (316) 978-6352 =20 =20 IMPORTANT NOTICE: =20 This message is intended only for the use of the individual entity= to which it is addressed and may contain information that is pr= ivileged, confidential and exempt from disclosure under applicable la= w. If you have received this message in error, you are hereby notifie= d that we do not consent to any reading, dissemination, distribution= or copying of this message. If you have received this communication= in error, please notify the sender immediately and destroy the trans= mitted information. =20 On 04/14/2011 07:55 AM, Bob Masta wrote: =20 =20 I don't know if this is relevant, but I have heard=20 audiologists say that it is well-known that (right-handed)=20 rifle shooters tend to have more left-ear loss, because=20 their head shields their right ear from the muzzle wave. =20 The opposite is the case for (right-handed) pistol=20 shooters.=20 Is it possible that your colleague sees lots of military=20 (and former military) patients? The military uses mostly=20 rifles, not pistols, and most people are right-handed. Just a thought... Best regards, Bob Masta =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D On 14 Apr 2011 at 12:56, Peter van Hengel wrote: =20 =20 Dear list, a colleague of mine is very interested in unilateral hearing loss. He's be= en working in audiology for over 30 years and claims that in his experience= it is much more common for the left ear to be affected than the right. Furthermore, if the right ear is affected, and the person is also right-handed, the problems with processing auditory information are much larger than in cases of left-sided hearing loss and/or left-handedness. However, he does not know of any publications on the subject. Is there anyone on the list who knows? All the best, Peter van Hengel Audiologisch Centrum Twente the Netherlands =20 =20 Bob Masta =20 D A Q A R T A Data AcQuisition And Real-Time Analysis www.daqarta.com Scope, Spectrum, Spectrogram, Signal Generator Science with your sound card! =20 =20 =20 ----------MB_8CDC8DA7F648C68_F1C_1AAE9_webmail-d146.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii" <font color=3D'black' size=3D'2' face=3D'Arial, Helvetica, sans-serif'><fo= nt color=3D"black" size=3D"2" face=3D"Arial, Helvetica, sans-serif"> <div> Anecdotally speaking, it's not just the head muffle effect, but also= the proximity of the barrel recoil to the left ear in RH shooters. But I= try not to make these generalizations and tend more to ask my patients to= simulate how they hold their rifles and shoot. <br> <br> As for Auditory processing, I can't cite anything right now off the top of= my head, but your friend may possibly be referring to the Right Ear Advan= tage and the maturity of the corpus callosum.&nbsp; In younger children an= d young adults (up to around 12 years or so), there is a greater differenc= e in how the left ear and right ear "process" information due more to the= immaturity of the CC.&nbsp; However, this difference should resolve as th= e person matures and the pathways are more developed. <br> </div> <div> <br> </div> <div style=3D"clear:both"><font color=3D"black" size=3D"2" face=3D"Arial,= Helvetica, sans-serif"><font color=3D"black" size=3D"2" face=3D"Arial, He= lvetica, sans-serif"><font color=3D"black" size=3D"2" face=3D"Arial, Helve= tica, sans-serif"><font color=3D"black" size=3D"2" face=3D"Arial, Helvetic= a, sans-serif"><font color=3D"black" size=3D"2" face=3D"arial">~~~~~~~~~~~= ~~~~~~~~~~~~~~~~~~~~~ <br> Harriet B. Jacobster, Au.D., CCC-A, FAAA <br> ASHA Certified in Audiology <br> hjacobster@xxxxxxxx</font></font></font></font></font></div> <div> <br> </div> <div> <br> </div> <div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">----= -Original Message-----<br> From: Mark Shaver &lt;mdshaver@xxxxxxxx&gt;<br> To: AUDITORY@xxxxxxxx<br> Sent: Thu, Apr 14, 2011 10:56 am<br> Subject: Re: Unilateral hearing loss<br> <br> <div id=3D"AOLMsgPart_2_f1fdd535-104d-4d03-bb60-ca8db056e93f"> =20 =20 =20 =20 =20 Shooting for right-handers may increase the magnitude for the ear effect but I believe it is also present when noise exposure is not known to be more pronounced on either side <a target=3D"_blank" __remo= vedlink__285128512__href=3D"http://www.ncbi.nlm.nih.gov/pubmed/6853839">(C= hung et al., 1983)</a>. It may be worth noting that there are asymmetries in olivocochlear function which others have suggested may relate to protection from noise. However, if I remember correctly these asymmetries were demonstrated in humans using contralateral suppression of TEOAEs which is representative of medial olivocochlear function. However, it seems that the lateral olivocochlear bundle is a better candidate for aiding in protection against noise.<br> <br> <br> <br> Mark<br> <br> <br> <br> =20 <div class=3D"moz-signature">Mark Shaver, PhD, CCC-A <br> Clinical Educator/Audiologist <br> Wichita State University <br> Evelyn Hendren Cassat Speech-Language-Hearing Clinic <br> (316) 978-6352 <br> <br> IMPORTANT NOTICE: <br> This message is intended only for the use of the individual entity to which it is addressed and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If you have received this message in error, you are hereby notified that we do not consent to any reading, dissemination, distribution or copying of this message. If you have received this communication in error, please notify the sender immediately and destroy the transmitted information.</div> <br> On 04/14/2011 07:55 AM, Bob Masta wrote: <blockquote type=3D"cite"> <pre>I don't know if this is relevant, but I have heard=20 audiologists say that it is well-known that (right-handed)=20 rifle shooters tend to have more left-ear loss, because=20 their head shields their right ear from the muzzle wave. =20 The opposite is the case for (right-handed) pistol=20 shooters.=20 Is it possible that your colleague sees lots of military=20 (and former military) patients? The military uses mostly=20 rifles, not pistols, and most people are right-handed. Just a thought... Best regards, Bob Masta =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D On 14 Apr 2011 at 12:56, Peter van Hengel wrote: </pre> <blockquote type=3D"cite"> <pre>Dear list, a colleague of mine is very interested in unilateral hearing loss. He's be= en working in audiology for over 30 years and claims that in his experience= it is much more common for the left ear to be affected than the right. Furthermore, if the right ear is affected, and the person is also right-handed, the problems with processing auditory information are much larger than in cases of left-sided hearing loss and/or left-handedness. However, he does not know of any publications on the subject. Is there anyone on the list who knows? All the best, Peter van Hengel Audiologisch Centrum Twente the Netherlands </pre> </blockquote> <pre>Bob Masta =20 D A Q A R T A Data AcQuisition And Real-Time Analysis <a class=3D"moz-txt-link-abbreviated" target=3D"_blank" __remov= edlink__285128512__href=3D"http://www.daqarta.com">www.daqarta.com</a> Scope, Spectrum, Spectrogram, Signal Generator Science with your sound card! </pre> </blockquote> =20 </div> <!-- end of AOLMsgPart_2_f1fdd535-104d-4d03-bb60-ca8db056e93f --> </div> </font></font> ----------MB_8CDC8DA7F648C68_F1C_1AAE9_webmail-d146.sysops.aol.com--


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