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Family resemblances facilitate formation and expansion of functional equivalence classes in pigeons

Authors
  • Jitsumori, Masako1
  • Shimada, Naoki1
  • Inoue, Sana1
  • 1 Chiba University, Department of Cognitive and Information Sciences Faculty of Letters, L-33 Yayoi-Cho, Inage-Ku, Chiba, 263-8522, Japan , Chiba (Japan)
Type
Published Article
Journal
Learning & Behavior
Publisher
Springer-Verlag
Publication Date
May 01, 2006
Volume
34
Issue
2
Pages
162–175
Identifiers
DOI: 10.3758/BF03193192
Source
Springer Nature
Keywords
License
Yellow

Abstract

Four pigeons were given repeated reversal training and testing with photographs of human faces constituting two categories structured by family resemblances, each consisting of a prototype, good exemplars, and poor exemplars. Each of the good exemplars (AM, BM, and CM) was created by 50% morphing of the prototype (M) and one of the poor exemplars (A, B, and C, respectively) and thus was physically similar to the prototype and to the corresponding poor exemplar. The pigeons were first trained and tested for the formation of two (AM, BM, and CM) classes. Then, the stimulus sets were extended to include (1) M and the poor exemplars that were not physically similar to one another and (2) 50% morphs of the poor exemplars (AB, BC, and CA). In the sequentially introduced training and test phases, we successfully tracked expansion of the functional equivalence classes consisting of exemplars that had little similarity but could be linked together through other members of the class. nt]This research was supported by Grant 16530465 from the Japan Society for the Promotion of Science to the first author. A portion of this work was presented as an invited talk at the International Congress of Psychology, Beijing, August 2004.

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