Mindfield eSense Muscle, Quick Manual, Page: 27 / 42

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surface EMG electrodes are placed immediately leads to increased trace in the
EMG signal.
However, involuntary reactions, such as stress, inner tension and emotional
experience, can also be measured as (tonic) activity in the EMG. EMG
biofeedback can also report the general psychophysiological tension.
The interplay between the autonomic and somatic nervous systems can be
depicted particularly well in the EMG. Increased muscle tone is mainly based
on an increase in sympathetic activity. A decrease can be attributed to more
robust parasympathetic activation.