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.
The figure below shows six tongue-palate contact patterns observed in normal English-speaking adults when producing lingual consonants:
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.
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
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).|
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.
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.
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.
LinguaGraph EPG connects to the host computer via the SNORS+ USB Interface (sold separately).
|Operating Systems||Windows 8, 7, Vista or XP|
|CPU||Minimum 1 GHz Intel® Pentium® or equivalent|
|Memory||Minimum 1 GB of RAM|
|Storage||100 MB of free hard disk space
|Software||icSpeech Professional Edition|
|Connectivity||SNORS+ USB Interface|