Articulography

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Electromagnetic midsagittal articulography is a transmitter system in which very small receivers, placed at various points (e.g. lips, teeth, parts of the tongue), send movement signals which are accurately plotted as articulatory trajectories, using a system of absolute coordinates.

Comment

This technique can be used to show that vertical tongue body movements during the articulation of a consonant are affected by such factors as voicing and the nature of adjacent vowels.

References

Watch the articulators in motion

Link

Utrecht Lexicon of Linguistics