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Jaw clenching may aect
most or all channels,
especially if clenching hard.
Light jaw clenching or
tightness can be observed
in F7/F8, T3/T4. Take note
of any temporomandibular
joint disorders: these can
cause artifact without typical
clenching.
The tongue is a large
polarized muscle, with the
tongue’s tip negative with
respect to the base of the
tongue. When the tongue
moves around the mouth,
it generates a moving eld
causing recording disruptions.
Disruptions may be seen
down the midline (Fz, Cz, Pz).
Tongue movement during
talking can be seen on many
channels.
UnderstandingReadings
MuscleArtifact:JawClench
MuscleArtifact:TongueMovement
Swallowing invokes
movement of several muscles
in the mouth, including the
tongue, causing disruption
of many channels. Ignore
swallowing if infrequent, but
frequent swallowing may limit
usable data.
MuscleArtifact:Swallowing
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