Electropalatography system


Electropalatograph 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.

LinguaGraph can be configured in single or dual channel mode. Synchronised audio and airflow data capture is also supported.

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 patient, 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 design. The palate is custom-made for each patient and simply clips to the upper teeth. The wires from the palate are connected to the LinguaGraph unit, which is worn around the neck.

Please contact us for details about our EPG palate service.

Compatible software

icSpeech Professional Edition

LinguaGraph EPG is compatible with icSpeech Professional Edition (sold separately), which supports a wealth of features, including:

  • Multi- channel EPG
  • Lingual parameters
  • Palatograph displays
  • Waveform displays
  • Bar charts
  • Games

Lingual parameters

Lingual parameters can be displayed as numeric values, waveforms, bar charts or used to control games. The following lingual parameters are derived from the EPG data:

Alveolar Contact The amount of contact in the front two rows of the palate.
Palatal Contact The amount of contact in the middle three rows of the palate.
Velar Contact The amount of contact in the rear three rows of the palate.
Left Lateral Contact The amount of contact in the left two columns of the palate.
Right Lateral Contact The amount of contact in the right two columns of the palate.
Midline Contact The amount of contact in the centre four columns of the palate.
Weight The number of contacts over the entire palate.
Balance The balance of contact from left to right.
Centre of Gravity The linear centre of gravity of the total contact region, specified as a row number, from front to back of the palate.
EPG Template Match Compares the patient's EPG contact pattern with an EPG template. The comparison is expressed as a percentage (0% = no match, 100% = perfect match).

Palatograph display

Watch Electropalatography on YouTube
Click on image to watch video

The palatograph display provides real-time visual feedback on the location of tongue contact with the hard-palate. Segments are arranged in palatal zones and rows to depict the individual EPG contacts.

This example illustrates the palatograph for the /s/ sound. The individual segments are colour coded to highlight the following palatal zones:

  • Alveolar (blue) - front two rows.
  • Palatal (green) - middle three rows.
  • Velar (red) - rear three rows.

Colour coding the palatal zones has been found to simplify regional targeting, especially in young children.

Waveform display

The waveform display is often used in therapy because it allows the patient to see the dynamics of their speech during the utterance of complete words or phrases.

Electropalatography waveform display

This example shows Alveolar (blue), Palatal (green) and Velar (red) tongue-palate contact waveforms for the word "Seat". The corresponding palatograms are also shown.

Recording and analysis

Recordings are useful for making permanent records of your therapy sessions and allow you to perform precise, repeatable measurements on the recorded electropalatography data. Measurements are performed on the waveform display by positioning cursors over areas of interest.


icSpeech Professional Edition contains six interactive speech therapy games. Each game features adjustable targets, rewards and can be controlled by LinguaGraph EPG.

Electropalatography games


LinguaGraph EPG connects to the host computer via the SNORS+ USB Interface (sold separately).

Electropalatography Connectivity

System requirements

Operating Systems Windows 8, 7, Vista or XP
CPU Minimum 1 GHz IntelĀ® PentiumĀ® or equivalent
Memory Minimum 1 GB of RAM
Storage 100 MB of free hard disk space
Software icSpeech Professional Edition
Connectivity SNORS+ USB Interface

Buy online

LinguaView EPG

Package includes:

  • LinguaGraph EPG unit
  • Neck strap
  • Wrist strap and cord
  • User manual
  • Quick start guide
  • 12 months guarantee
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Tax and duties

Please note that if the delivery address is outside of the EU, your purchase may be subject to import duties and taxes, which are levied once the goods reach the country of destination. Any such charges levied in relation to customs clearance must be paid by you.