auditory modelling at essex university

Essex Hearing Research Laboratory

 


Wivenhoe Park, Colchester CO4 3SQ, United Kingdom, Tel +44(0)1206 87333
copyright 1999-2011 University of Essex. All rights reserved
page updated on 2 July 2013

Introduction

The main purpose of this page is to make our software available to everyone.

All of the software can be downloaded in a single package called MAP1_14. This package contains both the computer modeling code and the measurement software. The latest version of the modeling code is under active development. click here to download latest version of the software

An earlier version of the model called MAP1_9 is still available but is no longer supported. It has better documentation than MAP1_14 and is increasingly out of date but remains a viable system.

Even earlier the models were generated using C-code. Essex no longer supports this but Lowel O’Mard (the original author) continues to support this at  http://dsam.org.uk.

Figure 1. MAP response to speech input

MATLAB model of the auditory periphery (MAP)

All software for modelling the auditory periphery has been written in MATLAB code.  If you need help to use the code, please contact the author at rmeddis@essex.ac.uk. We are keen that the code should be generally useful and will give assistance and explanations to researchers wanting to use the code for their own purposes.

There is no copyright and no fees apply. Also, the author accepts no responsibility for any consequences that arise from the use of the code.

The figure shows an example of the model response to a speech input. It computes the response at a succession of levels of the auditory system; stapes, basilar membrane (DRNL), IHC receptor potential, vesicular release at the synapse and auditory nerve spike activity.

The package features ready-made test programs to show the model in operation. A substantial manual is provided to assist programmers who wish to use the code for their own projects.

The system is modular with separate code for each stage of auditory processing.

Measurement software

Our interests at Essex have shifted towards the modelling of hearing impairment in our ‘Hearing Dummy’ project. As part of this project we have developed software (MultiThreshold) for testing our patients. This software allows us to measure a range of thresholds, psychophysical tuning curves and compression functions.

We aim to generate individualised models of impairment for each patient that we study. The models and the patients are tested on the same MultiThreshold software so as to better evaluate the models. For this reason, the assessment software and the modelling software are integrated into the same package. However, the two types of software can be used completely independently.


Figure 2. MultiThreshold psychometric assessment tool A:operator console  B: subject response bar.

Figure 2. MultiThreshold psychometric assessment tool A:operator console  B: subject response bar.

Department of Psychology at the University of Essexhttp://www.essex.ac.uk/psychology/department/home.html