Electropalatography (EPG) System


Electropalatography (EPG) System

The LinguaGraph electropalatography (EPG) system monitors tongue contact with the hard-palate during speech. Electropalatography provides direct articulatory information that can be used to monitor and improve articulation patterns.

The lightweight portable design and Skype compatibility makes LinguaGraph ideal for clinical or home-based articulation therapy.

How electropalatography works

Electropalatography determines tongue-palate contact by using a special artificial palate that contains 62 electrodes embedded on its lingual surface. A small electrical signal is sent to the user, which is conducted through the tongue to any touched electrodes. These tongue-palate contact patterns are then displayed on a computer screen.

How electropalatography works

The figure below shows six tongue-palate contact patterns observed in normal English-speaking adults when producing lingual consonants:

Electropalatography contact patterns
electropalatography palate

Electropalatography palate

LinguaGraph is compatible with the Reading electropalatography palate (sold separately). The palate is custom-made for each user and simply clips to the upper teeth. The wires from the palate are connected to the LinguaGraph unit, which is worn around the neck.

Click here for details about our EPG palate manufacturing service. We also supply EPG palate kits that enable orthodontic technologists to manufacture palates locally.

Software options


LinguaView EPG software

LinguaView is easy-to-use software that is ideal for basic clinical, research or home use:

Preview tongue-palate contact in real-time
Record tongue-palate contact and audio
Playback tongue-palate contact and audio
Tongue-palate contact template library
Tongue-palate contact template editor
Create tongue-palate contact videos
Anatomical or classic palatograph displays
Windows 10, 8, 7 and Vista compatible
10 user license

LinguaView 3D

LinguaView 3d EPG

LinguaView 3D incorporates state-of-the-art computer animation and 3D modelling techniques :

Preview 3D tongue-palate contact in real-time
Record 3D tongue-palate contact and audio
Playback 3D tongue-palate contact and audio
3D tongue-palate contact template library
3D tongue-palate contact template editor
360˚ photorealistic and stylised views
Upper & lower jaw with adjustable transparency
Compatible with icSpeech Professional Edition
Compatible with Windows 64-bit 10 and 8

icSpeech Professional Edition

LinguaGraph EPG is compatible with icSpeech Professional Edition, which supports a wealth of additional features, including:

icSpeech Professional Edition
Multi-channel EPG
Anatomical or classic palatograph displays
Waveform displays
EPG Games
Extensive lingual parameters and analysis
EPG data export facility
EPG Template matching
Recorder with picture & word prompting
Combines EPG with acoustic, airflow, voicing and video data
Windows 10, 8, 7 and Vista compatible
icSpeech Professional Edition - electropalatography analysis

The above image shows the tongue-palate contact patterns recorded for /s/ in the word "Smoke".

icSpeech Professional Edition - electropalatography template mataching

EPG template matching compares the user's tongue-palate contact pattern with an EPG template. The comparison is expressed as a percentage (0% = no match, 100% = perfect match) and can be used to control a series of games. In the above example, there is an 85% match between the user tongue-palate contact pattern (red) and the EPG template (blue) for /k/.

icSpeech Professional Edition - electropalatography games

icSpeech Professional Edition contains six interactive speech therapy games. Each game features adjustable targets, rewards and can respond to a number of EPG parameters.

Remote articulation therapy

When connected to a computer via USB, LinguaGraph is recognised as a standard webcam. This enables LinguaGraph to be used with Skype and other videoconferencing software for remote articulation therapy.

Using EPG with Skype

To arrange a live Skype demonstration, please contact us.

Electropalatography in use

Speech therapist discussing electropalatography Parent discussing electropalatography

System requirements

Supported operating systems Windows 10, 8, 7 or Vista
Supported computers Desktop, laptop, tablet
Connectivity USB 1.0, 2.0, 3.0
Power USB bus powered
Palate type Reading
Resolution 62 electrode
Sensitivity Manual adjustment
Maximum frame rate 200 frames per second
Skype compatibility Skype for Windows desktop, version 7.0 and later
Electropalatography Bundle

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Package includes:

  • LinguaGraph EPG unit
  • Carry case
  • Neck strap
  • Wrist strap
  • Handgrip
  • Signal cord
  • 2 meter locking USB cable
  • User manual
  • 12 months guarantee
  • LinguaView (optional)
  • LinguaView 3D (optional)
  • icSpeech Professional Edition (optional)
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