Vocal fold vibration associated with inspiratory phonation—An acoustic and electroglottographic study

Unlike normal phonation (EP), inspiratory phonation (IP) involves speech production using ingressive airflow. It is often used in clinical voice assessment and treatment. The present study examined the voice and glottal vibratory characteristics associated with IP by means of acoustic and electroglottographic (EGG) analyses. Acoustic and EGG signals of the vowel /i/ produced by 44 young vocally healthy adults (22 men and 22 women) using IP and EP were simultaneously recorded and later analyzed using Praat. EGG parameters included contact quotient (CQ), contact quotient perturbation (CQP), contact index (CI), relative contact rise time (RT), slope of the contacting phase (Slopecon), slope of the de-contacting phase (Slopedecon), amplitude, %JitterEGG, %ShimmerEGG, and HNREGG. Acoustic parameters included F0AC, %JitterAC, %ShimmerAC, and HNRAC. During IP, mean F0EGG, %JitterEGG, and %ShimmerEGG increased, while HNREGGdecreased. Mean F0AC, %JitterAC, and %ShimmerAC increased during IP, with no significant difference between IP and EP for HNRAC. CQP, CI, and RT increased, while Slopecon and amplitude decreased during IP, with no significant difference between IP and EP for CQ and Slopedecon. Results indicated marked differences in voices and glottal vibration between IP and EP.