A non-comercial educational resource for the Audiology profession

Welcome to the Cortical ERA Home Page


This is a non-profit educational & technical resource site for Audiologists to promote the development, availability and clinical use of Cortical electric response audiometry, a technique for objective hearing threshold estimation based on the "N1-P2" response.

The impetus for creating this site is to:

  • inform the international audiological community of the benefits and limitations of Cortical ERA;
  • compensate for some misinformation on, or ignorance of, this subject in the literature;
  • showcase a system designed by the author of the site to demonstrate how Cortical ERA can be implemented to produce a user-friendly, fast and efficient test (note that the site's author has no interest in sales of equipment);
  • generate sufficient user demand to persuade equipment manufacturers to make an efficient version of this test available on their evoked potential systems.


Latest: Guidance on performing CAEP testing of adults for threshold estimation purposes has been published by the British Society of Audiology. It is available here.


The site's author is Guy Lightfoot PhD, a Consultant Audiological Scientist based in Liverpool, UK with a long-standing special interest in the subject. Guy obtained a BSc in Physical Electronics in 1976, an MSc in Audiology in 1979 and a PhD in ABR stimulus repetition rate effects in 1991. He is a Chartered Scientist and registered in England as a Clinical Scientist. With colleagues Dr Steve Mason, Dr John Stevens and Prof David Kemp, Guy has organised and contributed to the well-established series of ERA & ABR courses and has co-authored many of England's Newborn Hearing Screening Programme (NHSP) guidelines. In August 2013 Guy retired from his position at the Royal Liverpool University Hospital and formed ERA Training & Consultency Ltd, to facilitate the continuation of the ERA & ABR courses and to provide clinical support and ABR Peer Review services for staff who perform ABR tests on newborns - a function he provided on behalf of NHSP.


Your feedback on this site is welcomed. Please use the Contact Us page to email comments, suggestions or queries


Disclaimer: Whilst every effort is made to provide correct information, the author cannot accept responsibility for errors of fact, omission or interpretation. The reader should understand that some content carries personal opinions.