10.34691/UCHILE/ACMKCO Zutta-Arellano, Dorianhttps://orcid.org/0000-0003-0961-2137(Universidad de Chile)Cembrano, Paulinahttps://orcid.org/0009-0000-7938-2942(Universidad de Chile)Miguez, Gonzalohttps://orcid.org/0000-0001-6975-3789(Universidad de Chile)Delgado-Troncoso, Belénhttps://orcid.org/0009-0000-8701-6387(Universidad de Chile)Martínez-Córdova, Vicentehttps://orcid.org/0009-0002-9949-7602(Universidad de Chile)Laborda, Mario A.https://orcid.org/0000-0003-2459-3042(Universidad de Chile) Repositorio de datos de investigación de la Universidad de Chile 2026 doi:10.34691/UCHILE/ACMKCO/94EOTEdoi:10.34691/UCHILE/ACMKCO/PYZJV0 This dataset corresponds to the experiment “Manipulation of Partial and Complete Opposition Relations in Arbitrarily Applicable Relational Responding (AARR) of Fear: A Pilot IRAP Experiment.” It contains two data files: one with total scores from the Fear of Spiders Questionnaire (FSQ), and another with the transformed D-scores from the Fear-IRAP (F-IRAP), including both trial-type scores and a composite D-IRAP score. Zutta-Arellano, Dorian(Universidad de Chile)