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A

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a schedule in which a response is reinforced when either of two (or more) schedule requirements is satisfied (e.g., in alternative FR 10 Fl 60-s, the tenth response or the first response after 1 minute is reinforced, whichever comes first, and both schedule requirements then start over).
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A response is reinforced on whichever of two schedules is satisfied first (e.g., after 5 minutes has elapsed or after 50 responses have been emitted, whichever occurs first).
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If an indirect-acting contingency is to increase or maintain performance, it should be an analog to avoidance.
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see BEHAVIOR ANALYSIS
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Environmental events or stimuli that occur immediately before a response. Used generically when it is not certain what function the event serves.
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A stimulus that precedes or accompanies a behavior and may exert discriminative control over that behavior.
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A stimulus that precedes some event or contingency; typically, a discriminative stimulus in a three-term contingency.
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Environmental events that occur before a behavior
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see SERIAL LEARNING
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see EMOTIONAL BEHAVIOR, PREAVERSIVE STIMULUS.

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