Cochlea

January / March 2018

Group Project with Shivam Bhatnagar, Lidia Dynes Martinez, Ben Greenberg, Jacob Mitchell and Ben Pheifer

The installation 'Cochlea' demonstrated the effects of hearing loss while listening to music. Cochlea creates a visualisation of an auditory experience.

 

HOW DO WE HEAR SOUND?

To hear sound, the outer part of our ears, the pinna channels sound waves down the ear canal to the ear drum. 

1.

This vibrates the ear drum, moving some tiny bones called the stapes.

2.

The stapes generate tiny pressure waves in the cochlea, a coil in the inner ear.

3.

The cochlea is lined with over 20,000 fibres of increasing resonant frequency from the centre outwards.

4.

When the pressure waves trigger these fibres, they cause hair cells to vibrate, sending electrical signals to the brain for processing as noise.

5.

Frequency of sound heard along the cochlea in Hertz

 

HEARING LOSS

Auditory Processing Disorders

The problem lies in the brain, it cannot process the information received correctly

Sensorineural Hearing Loss

The cochlea gets damaged, rendering it unable to send signals to the brain properly

Conductive Hearing Loss

A problem in the outer or middle ear stops sound being passed to the inner ear properly

Mixed Hearing Loss

Both conductive and sensorineural hearing loss occur together

For this project, 2 causes of hearing loss were modelled:

Presbycusis

The sensorineural hearing loss occurs naturally as people age. Sufferers lose the ability to hear higher pitched sounds.

Noise Induced Hearing Loss

Hearing Loss that is caused by exposure to loud sounds for an unsafe length of time. It affects frequencies in the range 2 to 6 KHz.

!

dB HL is a unit to measure what proportion of sound can be heard compared with perfect hearing

Max 7, a visual coding software was used to model the 2 types of hearing loss

 

The raw dB Hearing Levels were converted into multipliers to apply to corresponding frequencies of sound using this equation.

Noise Induced Hearing Loss

Presbycusis

Once the audio track with the selected frequencies removed had been generated, the corresponding portions of the cochlea were illuminated.

An interface was developed for audience members to control the exhibit

CONTRIBUTION

- Max 7 code patches to generate the filtered audio tracks

- Hearing loss research

- Liaising with an expert audiologist

 

© Anna Bernbaum