Emergence of reflexivity relation without identity matching-to-sample training in hooded crows (<em>Corvus cornix</em>)

Maria Samuleeva; Anna Smirnova

doi:10.21638/spbu03.2020.202

Authors

Maria Samuleeva Faculty of Biology, Lomonosov Moscow State University, Leninskiye Gory, 1–12, Moscow, 119192, Russian Federation; Center for Biopsychological Research, Moscow Institute of Psychoanalysis, Kutuzovskij pr., 34, Moscow, 121170, Russian Federation https://orcid.org/0000-0002-6855-7046
Anna Smirnova Faculty of Biology, Lomonosov Moscow State University, Leninskiye Gory, 1–12, Moscow, 119192, Russian Federation https://orcid.org/0000-0002-4446-2990

DOI:

https://doi.org/10.21638/spbu03.2020.202

Abstract

The ability to form equivalent relations between sign and referent—symbolization—is one of the important cognitive components of language. Equivalent relations have the properties of symmetry (if A→B then B→A), reflexivity (A→A, B→B), and transitivity (if A→B and B→C, then A→C). The current study evaluates whether reflexivity can be spontaneously revealed in hooded crows (Corvus cornix) without training after the formation of the symmetry relation. These birds were previously taught an arbitrary matching-to-sample task with the letters “S” and “V” as samples, and sets of images (same-sized and different-sized figures) as comparisons. Positive results in the transfer tests showed that the crows associated letters with the concepts of sameness/difference. After that, they successfully passed the symmetry test, in which samples and comparisons were switched around. In the present experiment we found out that the crows passed the reflexivity test (A→A, B→B) without identity training. We hypothesize that if the subject associates the sample not with certain stimuli but rather with concepts, it facilitates the formation of equivalence relations between them.

Keywords:

equivalence, reflexivity, symmetry, concept formation, identity matching-to-sample, arbitrary matching-to-sample, hooded crows

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