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Displacement behavior is observed in the natural environment and is characterized as irrelevant, incongruous, or out of context. The activity of the animal does not make sense given the situation, and the displaced responses do not appear to follow from immediately preceding behavior. Like adjunctive behavior (see definition in this glossary), displacement activities arise when consummatory activities like eating are interrupted or prevented.
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Responding that reliably accompanies some other response that has been produced or occasioned by a stimulus, especially when the stimulus is presented according to a temporally defined schedule. Some usages emphasize the stimulus rather than the responding it engenders (e.g., in rats, food presentations typically produce eating reliably followed by drinking; the drinking is adjunctive and is sometimes said to be induced by the schedule of food presentation).
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A type of behavior that is evoked by or adjunctive to a relationship between behavior and environment represented in a schedule involving some other behavior. Also called evoked behavior.
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An adjustable stimulus is one which an animal may change as a result of its own behavior. A procedure where a bird may increase the length of a line by pecking at one key and decrease it by pecking at another is an example of an adjustable stimulus.
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A form of schedule in which a value (e.g., of interval or ratio) is changed in some systematic way from reinforcement to reinforcement as a function of the performance (e.g., a fixed ratio is adjusted after each reinforcement according to some measured aspect of the performance in the preceding session, such as the length of the pause before the first response).
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A schedule that changes according to some feature of the subject's performance. For example, a ratio requirement might be raised gradually as long as the ratio was completed within a given period of time. However, if pausing exceeded a given duration, the ratio would be reduced. This procedure is continued until the behavior reaches some predetermined criterion.
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See accidental reinforcement
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A style of research in which an investigator's primary goal is to generate support for a predetermined outcome or hypothesis.
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A person or group serving to protect a client's interests, not one who is employed as an agent of other individuals, an organization, or institution. Advocates, who may be community representatives such as clergymen, law students, or a panel of interested citizens, consider a program's goals and procedures in terms of what they believe is best for the individual client and argue on the client's behalf.
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Aggressive behavior that often accompanies extinction in its early phases, in the absence of any other identifiable precipitating events. 23

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