3D Electropalatography (EPG) system

LinguaGraph 3D is an electropalatography (EPG) system that 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, which can be rotated 360°, provides direct articulatory information in real-time.

How 3D electropalatography works

The LinguaGraph 3D electropalatography system determines tongue-palate contact by using a special artificial palate that contains 62 electrodes embedded on its lingual surface. 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 EPG unit, which is worn around the neck. A small electrical signal is passed to the user, which is conducted through the tongue to any touched electrodes. The detected tongue-palate contact patterns are then transferred to a computer via USB and used to animate a 3D model of the tongue.

How 3D electropalatography works

3D electropalatography contact patterns

The LinguaGraph 3D electropalatography system is language independent, and provides direct articulatory information wherever the tongue touches the hard palate. The tongue-palate contact patterns below represent typical lingual consonants produced by normal English speakers:

3D Electropalatography • alveolar stop /t/, /d/, /n/

Alveolar Stop
/t/, /d/, /n/

3D Electropalatography • alveolar grooved /z/, /s

Alveolar Grooved
/z/, /s/

3D Electropalatography • post-alveolar grooved /ʃ/, /ʒ/

Post-Alveolar Grooved
/ʃ/, /ʒ/

3D Electropalatography • double alveolar-velar /tk/, /kt/, /kl/

Double Alveolar-Velar
/tk/, /kt/, /kl/

3D Electropalatography • velar stop /k/, /g/, /ŋ/

Velar Stop
/k/, /g/, /ŋ/

3D Electropalatography • apical /l/


Electropalatography palate

The LinguaGraph 3D electropalatography system is compatible with the standard Reading EPG palate design. Each palate, sold separately, is custom-made for each user and simply clips to the upper teeth. In order to create an EPG palate, a qualified dentist must first take an impression of the upper palate and teeth. A plaster model is then created from the impression and sent directly to us for EPG palate manufacture.

Electropalatography palate

Electropalatography palate kit

Electropalatography palate kits enable orthodontic technologists to manufacture EPG palates locally. Each kit contains:

  • 62 silver electrodes with attached leads.
  • EPG Connector board.
  • EPG Connector board cover.
  • Heat shrink tubing.
  • Instruction manual.
Electropalatography palate kit

3D electropalatography software

The 3D electropalatography system comes complete with LinguaView 3D. This 64-bit Windows compatible software incorporates state-of-the-art computer animation and 3D modelling techniques to illustrate tongue-palate contact in real-time.

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
  • 360° photorealistic and stylised views
  • Upper and lower jaw with adjustable transparency
  • File format compatible with icSpeech Professional Edition


Supported operating systems Windows 64-bit 10, 8
Supported computers Desktop, laptop, tablet
Connectivity USB 1.0, 2.0, 3.0
Power USB bus powered
Palate type Reading, 62 electrode
Resolution 62 electrode
Sensitivity Manual adjustment
Maximum frame rate 200 frames per second
Minimum frame rate 50 frames per second

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The 3D electropalatography package includes:

  • LinguaGraph EPG unit
  • LinguaView 3D software
  • Carry case
  • Neck strap
  • Wrist strap
  • Handgrip
  • Signal cord
  • 2 meter locking USB cable
  • User manual
  • 12 months guarantee
3D Electropalatography package