3D Electropalatography (EPG) System

Electropalatography (EPG) System


LinguaGraph is a portable electropalatography (EPG) system that monitors tongue contact with the hard-palate during speech. Electropalatography provides direct articulatory information that can be used to study or improve articulation patterns.

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

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 Windows software that provides an ideal introduction to electropalatography:

  • 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
  • Compatible with videoconferencing software for remote articulation therapy
  • Windows 10, 8, 7 and Vista compatible
  • 10 user license

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

Electropalatography contact patterns

LinguaView 3D

LinguaView 3D uses state-of-the-art computer animation and 3D modelling techniques to illustrate where the tongue touches the hard-palate during speech. The 3D model consists of the tongue, hard palate, teeth and lower jaw. The transparency of these articulators can be adjusted to reveal hidden structures, and the model can be rotated 360°.

The figure below illustrates six 3D tongue-palate contact shapes observed in normal English-speakers when producing lingual consonants:

3D Electropalatography contact patterns

Additional features include:

  • Preview 3D tongue-palate contact in real-time
  • Record 3D tongue-palate contact at up to 200 FPS with fully synchronised audio
  • 3D tongue-palate contact template library
  • 3D tongue-palate contact template editor
  • Photorealistic and stylised views
  • File format compatible with icSpeech Professional Edition

icSpeech Professional Edition

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

  • Multi-channel EPG
  • Anatomical or classic palatograph displays
  • Waveform displays
  • Spectrogram 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

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

icSpeech Professional Edition - electropalatography games

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
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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