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Da Silva Souza, A; Abreu-Rodrigues, J (2010). Discriminative proprieties of Vary and Repeat contingencies. Behavioural Processes, 85(2):116-125.

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Pigeons were trained on an arbitrary matching-to-sample task in which Vary and Repeat contingencies
served as sample stimuli.During the sample component,two keys were litred and a four-peck sequence
was reinforced if its frequency was less than a certain threshold (Vary sample)or if it comprised one of
two target sequences (Repeat sample). During the comparison component, two keys were lit white and
green, and correct choices depended on the previous sample contingency. Pigeons learned to emit high and low variability levels during the sample, and correct matching choices were obtained. In two discrimination testing phases,the requirement of variation (Vary sample)or of repetition (Repeat sample)
was parametrically manipulated such that behavioral variability became undifferentiated between samples(low sample disparity) and then differentiated (high sample disparity)again. Accurate choices fell to
chance under low sample disparity conditions, but improved under high disparity conditions. The results
provide evidence that high and low variability levels can be produced in the absence of antecedent cues
and that pigeons can accurately report whether they had experienced a Vary or a Repeat contingency,
thus indicating that those contingencies may served iscriminative functions.


3 citations in Web of Science®
3 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:06 Faculty of Arts > Institute of Psychology
Dewey Decimal Classification:150 Psychology
Deposited On:20 Dec 2010 13:57
Last Modified:05 Apr 2016 14:29
Publisher DOI:10.1016/j.beproc.2010.06.018

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