We also calculated average values of the following electrophysiological parameters : 1 ) area and 2 ) duration of the rectified EMG signal from the suprahyoid/submental muscles related to the sucking and swallowing phases ; 3 ) EMG peak amplitude for the sucking and swallowing phases ; 4 ) area and peak amplitude of the laryngeal-pharyngeal mechanogram ; 5 ) oropharyngeal delay .