Table 1.

Definition of suck, swallow, duration, and latency

Terms	Definitions
Suckpre	The suck prior to the pharyngeal swallow occurs
Sucksw	The suck containing the beginning of the pharyngeal swallow
Suckpost	The suck following the Sucksw
PharSwon	The start of epiglottis flipping when the epiglottis just starts to move caudally. The frame time with the biggest caudal-cranial value before flipping caudally was set to the PharSwon
PharSwoff	The frame time after an abrupt return from caudal to cranial position, whose X-axis amplitude distance from the next frame position was less than 1.5 mm
PharSwDur	The duration of a pharyngeal swallow: PharSwDur = PharSwoff − PharSwon
suckon	The start of milk going into the oral cavity from the nipple
suckoff	The start of a new suck
suckDur	The duration of a suck: suckDur = suckoff − suckon
suck − PharSwlag	The lag of the Sucksw onset and the pharyngeal swallow onset: suck − PharSwlag = PharSwon − suckon*
PharSw − sucklag	The lag of the pharyngeal swallow onset and the Suckpost onset: PharSw − sucklag = suckon** − PharSwon

All temporal terms are italic

^*suck_on refers to the onset of Suck_sw

^**suck_on refers to the onset of Suck_post