AudiologyOnline Phone: 800-753-2160


Bernafon - Hearing Aids - April 2024

ECoG Evaluation Criteria

John A. Ferraro, PhD, MS, ASHA Fellow, FAAA

September 30, 2002

Share:

Question

What SP/AP ratio percentages or parameters are most often used to differentiate between normal and abnormal ECoG tracings? Does this criteria change depending upon the type of electrode used, specifically when using TM electrode?

Answer

Our norms are based on recordings from the TM. In general, an SP/AP amplitude ratio to 90 dB HL click stimuli greater than approximately 50% is considered to be enlarged. At times, we also use the SP/AP area ratio (based on a study by Tibbils and Ferraro) and the amplitude of the SP to tonebursts.

Finally, Margolis et al. like to measure the N1 latency difference between responses measured to condensation vs. rarefaction polarity clicks. A difference of greater than 0.34 msec. is considered a positive finding for endolymphatic hydrops.

Bio:

John A. Ferraro, Ph.D. Professor and Chairman Hearing and Speech Department University of Kansas Medical Center Co-Director KU Intercampus Program in Communicative Disorders Associate Dean for Research, School of Allied Health. Ph.D. in Hearing and Speech Sciences from University of Denver, post-doctoral fellowship in auditory electrophysiology at Northwestern University. Research interests are in the area of clinical applications of Auditory evoked potentials - several publications and presentations in this area, including a recent textbook entitled ''Laboratory Exercises in Auditory Evoked Potentials.''


John A. Ferraro, PhD, MS, ASHA Fellow, FAAA

Carolyn Doughty-Margaret Kemp Chairman and Professor, Hearing and Speech Department, University of Kansas Medical Center and - Co Director, University of Kansas Intercampus Program in Communicative Disorders ( both positions held since December, 1983)-

John A. Ferraro, Ph.D., FASHA, FAAA Degrees: Ph.D., Speech and Hearing Sciences, University of Denver, 1972. M.S., U. Denver, Biology B.S., Southern Colorado St. College, Biology Positions: Current: Carolyn Doughty-Margaret Kemp Chairman and Professor, Hearing and Speech Department, University of Kansas Medical Center and -    Co Director, University of Kansas Intercampus Program in Communicative Disorders ( both positions held since December, 1983)-    Associate Dean for Research, School of Allied Health, KU Medical Center (since October, 1999) Former:-    Associate Dean, School of Allied Health (1985 - 93) and      Acting Dean of SAH (1992 - 1993), University of Kansas Medical Center -    1972 1974: Post Doctoral Fellow, Auditory Research     Laboratory, Northwestern University (under the direction of Peter Dallos)  -    1974 1981: Asst./Assoc. Professor, Speech and Hearing Science Section, Ohio State University -    1981 1983: Clinical Neurophysiologist, Swedish Medical Center, Englewood, Colorado Research/Publication/Presentation History:  Over 70 publications (journal articles, book chapters, conference proceedings, etc.) and 150 presentations relating to the clinical applications of auditory evoked potentials/auditory   physiology.  -1997 textbook Laboratory Exercises in Auditory Evoked Potentials   (Singular Publishing, Inc.)

- Current Grant: Improved Method of Auditory Assessment in Infants, Deafness Research   Foundation. Professional Service  -     Substantive Change Committee of the ASHA Council of Academic Accreditation (2001 –
       present)
-     Vice President for Standards and Credentials, Council of Academic Programs in       Communication Sciences and Disorders (2002 – 2004) -    ASHA Council of Academic Accreditation in Audiology and Speech Language Pathology (1998 – 2002)-    ASHA-AAA-CAPCSD Joint Ad Hoc Committee on Doctoral      Education in Audiology (2001 – 2002)-    ASHA Vice President for Audiology Coordinating Committee (1997 - 2000)-    President (President-Elect, and Past-President) of the Council of Academic Programs in Communication Sciences and Disorders (1993-1996)-    Member of first ASHA Working Group on AEPs-    Chaired ASHA SID #6 Sub-Committee on AEP Specifications Recent Awards:  -    Honors of the Council of Academic Programs in Communications Sciences and     Disorders (2001). -    2002 Outstanding Honorary Alumnus, School of Allied Health, University of Kansas Medical      Center. -    2003 Center for Excellence Graduate Teaching Award, University of Kansas. (ASHA Fellow – 1992)"


Related Courses

Improving EHDI with CAEPs: Clinical Assessment of the Cortical Auditory Evoked Potential in Children with Hearing Loss
Presented by Elizabeth Musgrave, AuD, CCC-A
Recorded Webinar
AudiologyOnline

Presenter

Elizabeth Musgrave, AuD, CCC-A
Course: #31492Level: Intermediate1 Hour
  'Very pragmatic presentation regarding the clinical applications of cortical auditory evoked potentials and the value in using this procedure for the assessment of infants and children'   Read Reviews
This course will provide an overview of cortical auditory evoked potentials, current research, benefits and limitations to using CAEPs in a busy clinic, and several case studies.

View this Course for FREE.
Need CEUs? Become a AudiologyOnline member to get unlimited CEUs.

Only $129/yr

Learn More

What's New in the Otometrics Bio-logic Line of Devices?
Presented by Diane Sabo
Recorded Webinar
Natus

Presenter

Diane Sabo
Course: #32529Level: Advanced1 Hour
  'Very good information backed by '   Read Reviews
This presentation will highlight new innovations in technology within the new generation Bio-logic devices. These technologies are meant to help to improve efficiency and also add to the armamentarium of tests that can be performed with one device. Technology that will be discussed will be for ABR, ASSR and DPOAEs. ABR topics will cover data collection from both ears at the same time and spread spectrum technology. ASSR will highlight mixed rate ASSR and DPOAE will showcase the use of an FM signal, binaural OAE, pressurized OAEs and threshold estimation software to estimate audiometric thresholds using DPOAEs.

View this Course for FREE.
Need CEUs? Become a AudiologyOnline member to get unlimited CEUs.

Only $129/yr

Learn More

A Guide to Bithermal Caloric Testing
Presented by Amanda Cerka Mroz, AuD, FAAA, CCC-A
Recorded Webinar
Natus

Presenter

Amanda Cerka Mroz, AuD, FAAA, CCC-A
Course: #815Level: Intermediate1 Hour
  'Very concise and clear'   Read Reviews
No CEUs/Hours Offered
The purpose of this course is to provide an in-depth discussion of the caloric testing portion of the VNG/ENG test battery. Content will include descriptions of testing procedures, analysis and interpretation of results.

View this Course for FREE.
Need CEUs? Become a AudiologyOnline member to get unlimited CEUs.

Only $129/yr

Learn More

Auditory Brainstem Responses (ABR) to Brief-tone Bone-conducted Stimuli
Presented by Susan Small, PhD
Recorded Webinar
AudiologyOnline

Presenter

Susan Small, PhD
Course: #27716Level: Intermediate1 Hour
  'helpful for newborn hearing assessment'   Read Reviews
This webinar will discuss the history of brief-tone bone-conduction auditory brainstem (ABR) research and its clinical applications today as an essential component of early diagnosis of hearing loss in infants. Methodology and interpretation of bone-conduction ABRs to estimate bone-conduction hearing thresholds will be discussed in detail and cases will be provided to illustrate the principles explained. This webinar will be open captioned.

Please note: You may earn ABA Tier 1 credits for this course if you complete it as part of the course 27885, "Auditory Evoked Responses for Infant Hearing Assessment Series". Course 27885 contains recordings of all three events from our 2016 series on Auditory Evoked Responses for Infant Hearing Assessment. ABA Tier 1 CEUs can be earned only when all modules are completed as part of course 27885.

View this Course for FREE.
Need CEUs? Become a AudiologyOnline member to get unlimited CEUs.

Only $129/yr

Learn More

Intraoperative Neurophysiologic Monitoring: An Introduction to the Operating Room for the Audiologist
Presented by Krysta Gasser Rutledge, AuD
Recorded Webinar
AudiologyOnline

Presenter

Krysta Gasser Rutledge, AuD
Course: #29252Level: Introductory1 Hour
  'Although I am not involved in the IONM aspect of audiology this gave me an understanding of how an audiologist can be an integral part of the operating room team'   Read Reviews
This is the first webinar in a 3-part series on Intraoperative Neurophysiologic Monitoring, that will be taking place on AudiologyOnline in June 2017. This course will provide an overview of the operating room (OR) workplace to the generally unfamiliar audiologist. OR personnel and commonly enountered protocols will be discussed, along with an overview of neurophysiologic testing conducted in the OR.

Please note: You may earn ABA Tier 1 credits for this course if you complete it as part of the course 29665, "Interoperative Neurophysiologic Monitoring: Basics and Beyond." Course 29665 contains recordings of all three events from our series on Interoperative Monitoring. ABA Tier 1 CEUs can be earned only when all modules are completed as part of course 29665.

View this Course for FREE.
Need CEUs? Become a AudiologyOnline member to get unlimited CEUs.

Only $129/yr

Learn More

Our site uses cookies to improve your experience. By using our site, you agree to our Privacy Policy.