The Effects of Common and Uncommon Elements on the Emergence of Simple Discriminations Page: 13
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combat the likelihood that any extinguished responding would carry over from one stimulus
interval to the next.
Phase 3 ended after eight total intervals, four 15-second presentations of each stimulus
alternating, had elapsed. No consequences were provided for mouse clicks in the presence of
either music sample. After all eight intervals had elapsed, the music stopped, and the
experimenter ended the session.
Uncommon Elements Procedure
The procedures in the uncommon elements preparation were identical to the common
elements preparation except that the images presented in Phase 1 were of the plants and the
images presented in Phase 2 were of animals.
Interobserver Agreement
An independent observer collected data on the frequency of left mouse clicks during
Phase 3 for a combined total of 37.5 percent of discriminative stimulus and s-delta intervals.
Mean count-per-interval interobserver agreement was calculated for both types of intervals. The
total percent of agreement for discriminative stimulus or s-delta interval was combined and
divided by the total number of intervals of that type scored. Interobserver agreement for
discriminative stimulus intervals was 90 percent agreement. Interobserver agreement for s-delta
intervals was 97 percent agreement.13
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Niland, Haven Sierra. The Effects of Common and Uncommon Elements on the Emergence of Simple Discriminations, thesis, May 2019; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc1505220/m1/19/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .