Abstract: An EMG study was conducted to examine muscular coordination of jaw articulation and prosody production in Japanese, using noninvasive technique to record EMG signals from the cricothyroid (CT) and the strap muscles (the infra- and suprahyoid muscles). The signals from arrays of miniature surface electrodes attached on the neck surface were processed to form a chronotopographic EMG, i.e., the place vs. time display of neck surface electrical potential. The EMG signal of the CT is extracted by removing signals from the superficial muscles. Jaw movement is monitored simultaneously. The basic accentual pattern is produced by CT activity for raising F0 followed by an activation of the strap and a suppression of the CT. The activity of the strap either to lower F0 or to lower the jaw tends to vary with overall F0 pattern of utterances. The results suggest a complicated relationship between jaw articulation and prosody control: strap activity and the degree of jaw opening are slightly reduced when high F0 is maintained due to sandhi, and F0 rise tends to be suppressed at jaw lowering in some accent kernels of focussed words.