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N

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A written description of behavior in progress. The recorded events then can be ordered into a sequence analysis that specifies a behavior, its antecedents, and its consequences. 2
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Stimulus changes which are produced by (and are dependent on) the behavior of the individual who experiences them. Natural consequences are contrasted with artificial or , by trinsic consequences, which are provided by (and are dependent on) the behavior of others.
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A class of discriminative stimuli produced through presentations of complex natural stimuli (as when a pigeon discriminates between pictures with and pictures without trees in them). CL PROBABILISTIC STIMULUS CLASS.
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A discriminative stimulus indigenous to- the natural environment, not one artificially introduced. The printed word is a natural SD for reading the word; a hint is not. The hour that marks the beginning of the work day is a natural SD for starting to work. 15
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A reinforcer indigenous to the natural environment. A good mark is usually a natural reinforcer in a school setting as is pay for a worker. 9
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Sometimes used in place of primary reinforcer or intrinsic reinforcer. The relativity of reinforcers limits the usefulness of this term; cf. REINFORCEMENT.
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Reinforcers that have not been arranged by someone for the purpose of modifying behavior; also called spontaneous or unplanned reinforcers.
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The Darwinian account of evolution in terms of the selection of members of a population over generations. Different features survive in a population as a result of interactions between the range of genetic variations available in the population and the properties of evolutionary environments.
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Behaviors which a person lacks which are necessary in order to function effectively and independently both in the present and in the future.
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A systematic method for identifying goals to target for programmatic change' Needs assessment may include observations, tests interviews, questionnaires, and other sources of input. 4

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