Table 2.

Controlled vocabulary and definitions for feeding behaviors

Bite	Bite force production while grasping a substance with the jaws.
Isometric Bite	Bite force production with no motion of the jaws.
Ingestion	Initial acquisition and movement of a food or liquid substance from outside to inside the body.
Mastication	Food breakdown using the postcanine dentitiona.
Intraoral food processing	Food breakdown by structure(s) of the oral cavity (e.g., palatal rugae).
Intraoral transport	Movement of food or liquid from the lips through the oral cavity and into the pharynx. For food, this can include Stage I and Stage II (Hiiemae 2000).
Swallow(ing)	Movement of food or liquid through the pharynx and into the esophagus.
Complete feeding sequence	Movement of a substance from outside the body into the esophagus, and containing all processes/events: biting, ingestion, intraoral transport, mastication, swallowing, and oral food processing.
Feeding sequence	A sub-set of processes/events during movement of a substance from outside the body into the esophagus, including some of the following: biting, ingestion, intraoral transport, mastication, swallowing, and oral food processing.
Complete drinking sequence	Movement of fluid from outside the body through the pharynx and into the esophagus containing all processes/events: ingestion, intraoral transport, swallowing.
Drinking sequence	Movement of fluid from outside the body through the pharynx and into the esophagus, including some of the following: ingestion, intraoral transport, swallowing.
Suckle	Negative or reduced pressure in the oral cavity that gets fluid out of a nipple and into the oral cavity.

^aThere was intense discussion by the Working Group about whether to include a number of features of mastication that characterize most mammals. These features are precise occlusion of the postcanine dentition, unilateral placement of a food bolus, and transverse motion of the lower jaw during the power stroke. In the end, the decision was made to define mastication without reference to these commonly occurring mammalian characteristics in order to ensure that the initial analyses using FEED, based on search and download using mastication as a search term, include as many datasets as possible.