da Silva Souza, A; Abreu-Rodrigues, J; Baumann, A A (2010). History effects on induced and operant variability. Learning & Behavior, 38(4):426-437.
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Two experiments evaluated history effects on induced and operant variability. College students typed
three-digit sequences on a computer keyboard. Sequence variability was induced (by no reinforcement or
variation- independent reinforcement) or reinforced (by variation- or repetition-dependent reinforcement).
Conditions with induced and operant variability were presented according to a reverse between-groups de-
sign. In Experiment 1, we examined transitions from the variation or repetition contingencies to no reinforce-
ment, and vice versa. In Experiment 2, the variation or repetition contingencies were followed or preceded
by variation-independent reinforcement. The results showed that (1) a history of no reinforcement impaired
operant variability learning; (2) induced variability levels were higher and lower after a history of reinforce-
ment for variation and repetition, respectively; (3) repetition was more easily disrupted by no reinforcement
and independent reinforcement than was variation; and (4) response variability and stability were a function
of past and current reinforcement conditions. These results indicate that reinforcement history influences both
induced and operant variability levels
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||06 Faculty of Arts > Institute of Psychology|
|Deposited On:||20 Dec 2010 14:01|
|Last Modified:||23 Nov 2012 14:10|
|Publisher:||The Psychonomic Society, Inc.|
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