Editing Biofeedback (section)

====Muscle pain====
Budzynski and Stoyva (1969) showed that EMG biofeedback could reduce [[frontalis muscle]] (forehead) contraction.<ref>{{cite journal | vauthors = Budzynski TH, Stoyva JM | title = An instrument for producing deep muscle relaxation by means of analog information feedback | journal = Journal of Applied Behavior Analysis | volume = 2 | issue = 4 | pages = 231–7 | year = 1969 | pmid = 16795225 | pmc = 1311072 | doi = 10.1901/jaba.1969.2-231 }}</ref> They demonstrated in 1973 that analog (proportional) and binary (ON or OFF) visual EMG biofeedback were equally helpful in lowering masseter SEMG levels.<ref>{{cite journal | vauthors = Bydyznski T, Stoyva J | title = An electromyographic feedback technique for teaching voluntary relaxation of the masseter muscle | journal = Journal of Dental Research | volume = 52 | issue = 1 | pages = 116–9 | year = 1973 | pmid = 4509482 | doi = 10.1177/00220345730520010201 | s2cid = 34753419 }}</ref>
McNulty, Gevirtz, Hubbard, and Berkoff (1994) proposed that [[sympathetic nervous system]] innervation of [[muscle spindles]] underlies [[trigger points]].<ref>{{cite journal | vauthors = McNulty WH, Gevirtz RN, Hubbard DR, Berkoff GM | title = Needle electromyographic evaluation of trigger point response to a psychological stressor | journal = Psychophysiology | volume = 31 | issue = 3 | pages = 313–6 | date = May 1994 | pmid = 8008795 | doi = 10.1111/j.1469-8986.1994.tb02220.x }}</ref>