The effects of ITI fillers in autoshaping |
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| Institution: | 1. Departamento de Neurobiología Conductual y Cognitiva, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Campus Juriquilla, Querétaro, Querétaro 76230, Mexico;2. Maestría en Nutrición Humana y Maestría en Ciencias en Neurometabolismo, Facultad de Ciencias Naturales y Facultad de Medicina, Universidad Autónoma de Querétaro, Mexico;3. Departamento de Genética del Desarrollo y Fisiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Campus Morelos, Cuernavaca, Morelos, Mexico;1. Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, PA;2. Clinical Research Network Coordination, RTI, Research Triangle Park, NC;3. Department of Obstetrics and Gynecology, Cleveland, Cleveland, OH;4. Department of Obstetrics and Gynecology, University of Alabama at Birmingham, Birmingham, AL;5. Department of Obstetrics and Gynecology, Duke University, Durham, NC;6. Department of Obstetrics and Gynecology, Brown, Providence, RI;7. Department of Obstetrics and Gynecology, University of Pittsburgh, Pittsburgh, PA;8. Department of Obstetrics and Gynecology, University of New Mexico and Department of Women''s Health, Dell Medical School, University of Texas, Austin, TX;9. Department of Obstetrics and Gynecology, Kaiser Downey, Downey, CA;1. University of Oslo, Oslo, Norway;2. Massachusetts General Hospital Weight Center, Boston, Massachusetts;3. Harvard Medical School, Boston, Massachusetts;4. Oslo University Hospital, Oslo, Norway;1. Arizona State University, United States;2. Arizona State University and Columbia University, United States |
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| Abstract: | The present experiments used pigeons in an autoshaping procedure to examine the effects of a nonreinforced, nontarget stimulus presented during the intertrial interval on responding to a target CS. Experiments 1 and 2 found that a filler stimulus presented during a substantial portion of the ITI retarded responding to the target CS relative to a group not exposed to the filler. This group difference in performance was subsequently abolished by continued training and omitting the filler in the former group (Experiment 1) or adding a filler for the latter group (Experiment 2). Experiment 3 found that when the “filler” occupied most of the interreinforcement interval, CS-US pairings embedded within the “filler” stimulus yielded superior autoshaping relative to a group that received CS-US pairings embedded in static apparatus cues in the absence of the filler. The results are discussed with reference to the ways that a nontarget stimulus during the ITI can influence contextual modulation of responding to a discrete CS and the necessity for comparator theories to incorporate a “local context” view of cycle time to explain the present findings. |
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