YAWN - An involuntary gaping of the mouth accompanied by inspiration of air and, often, stretching of the body, Y19906. Definition from Hurnik et al., 1995. mpg video 521KB   Comment

YEANING - The process of giving birth in sheep and goats. Synonym: Kidding, Lambing. Y19907. Definition from Hurnik et al., 1995.

YEANLING - A young sheep or goat. Y19908. Definition from Hurnik et al., 1995.

YEARLING - An animal in its second year of life. Y19909. Definition from Hurnik et al., 1995.

YOKED CONTROL - The individual in a yoked experiment that receives reinforcement contingent on a given operant response of another individual(s~, while its own performance of the same response does not result in its reinforcement Y19914. Definition from Hurnik et al., 1995.

YOKED EXPERIMENT - An experiment in which the technique of yoked reinforcement is used, generally to separate the effect of reinforcement frequency from the effects of other variables. Y19915. Definition from Hurnik et al., 1995.

YOKED REINFORCEMENT - Reinforcement of one or more organisms that is contingent on a given operant response by another organism. For example, if an animal located in one compartment performs a given response, an :animal in a second compartment is presented with a reinforcement, regardless of its own responses. Y19916. Definition from Hurnik et al., 1995.

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