Behavior Analysis in Practice

, Volume 12, Issue 2, pp 423–429 | Cite as

Sample First versus Comparison First Stimulus Presentations: Preliminary Findings for Two Individuals with Autism

  • Joseph VedoraEmail author
  • Tiffany Barry
  • John C. Ward-Horner
Brief Practice


The current study was a replication of Petursdottir and Aguilar (Journal of Applied Behavior Analysis, 46, 58–68, 2016). Two different stimulus presentations were evaluated during auditory-visual discrimination training. A sample-first procedure, in which the sample stimulus was presented before the comparison stimuli, was compared to a comparison-first procedure, in which the sample presentation was presented after the comparison stimuli. The results indicated that both participants learned more quickly in the comparison-first condition, a finding that differed from Petursdottir and Aguilar (Journal of Applied Behavior Analysis, 46, 58–68, 2016).


Matching to sample Receptive language Stimulus control 


Compliance with Ethical Standards

Conflict of Interest

Joseph Vedora declares that he has no conflict of interest. Tiffany Barry declares that she has no conflict of interest. John C. Ward-Horner declares that he has no conflict of interest.

Ethical Approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed Consent

Informed consent was obtained from all individual participants included in the study.


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Copyright information

© Association for Behavior Analysis International 2018

Authors and Affiliations

  • Joseph Vedora
    • 1
    Email author
  • Tiffany Barry
    • 1
  • John C. Ward-Horner
    • 1
  1. 1.Evergreen CenterMilfordUSA

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