Wednesday, February 27, 2008


Electropalatography (EPG or palatometry) is a technique for recording the timing and location of tongue contact with the roof of the mouth (hard palate) during continuous speech. It requires the speaker to wear an artificial palate which is similar to an orthodontic brace and fits against the hard palate. This false palate has 62 silver elctrodes embedded in it, arrenged in groups to cover the alveolar ridge and the hard palate. The electrodes are sensitive to the contact by the speaker's tongue. The outputs of the electrodes are continuously monitored by computer while the speaker is talking. The resulting analysis is displayed in a series of figures known as palatograms. an example of such a system is LinguaGraph. The conventional way of displaying the output is in a grid of cells. The alveolar area is at the top and the border with the soft palate area is at the bottom. If a cell is empty, then no tongue contact was recorded there.
EPG can also be used to help diagnose speech disorders like cleft palate, articulation disorders, hearing impairement and in adults with aquired speech disorders (for example, difficulty with speech following a stroke).

You can read a little of this technique's history here. You can read here the procedure followed to do a research with this technique.

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