• Publications
  • Influence
Transitive inference formation in pigeons.
Pigeons were trained with 4 pairs of visual stimuli in a 5-term series―A+ B−, B+C, C+D→, and D+ E− (in which plus [+] denotes reward and minus [−] denotes nonreward)―before the unreinforced test pairExpand
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The nature of culture
Niko Tinbergen laid great stress on the essential importance of cultural evolution for the understanding of human behaviour although he never, of course, made it a central subject of his researchExpand
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Algebraic Learning and Neural Network Models for Transitive and Non-transitive Responding
Transitive inference is a kind of deductive reasoning. Given the premises “Anna is taller than Paul” and “Paul is taller than Mary”, adults and older children easily conclude that “Anna is tallerExpand
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Concept learning by pigeons: Matching-to-sample with trial-unique video picture stimuli
Pigeons were trained to match-to-sample with several new methodologies: a large number of stimuli, computer-drawn color picture stimuli, responses monitored by a computer touch screen, stimuliExpand
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Rotational invariance in visual pattern recognition by pigeons and humans.
Pigeons and humans chose which one of two alternative visual forms was identical to, or a mirror image of, a previously presented sample form. The two comparison forms were presented in variousExpand
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Preening and Associated Comfort Behavior in Birds a
  • J. Delius
  • Biology, Medicine
  • Annals of the New York Academy of Sciences
  • 1 May 1988
In most avian species the plumage also has an important extra function compared with the pelage of mammals: flight. Accordingly preening, as a behavior that conditions the bird's integument, can beExpand
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Head and eye movements in unrestrained pigeons (Columba livia)
Head and eye movements were simultaneously recorded during locomotory and pecking behavior of 4 pigeons (Columba livia), which were trained to traverse a conditioning chamber, with a pecking key andExpand
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Transitive responding in animals and humans: Exaptation rather than adaptation?
In order to survive and reproduce, individual animals need to navigate through a multidimensional utility landscape in a near-optimal way. There is little doubt that the behaviourally more advancedExpand
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Orientation invariant pattern recognition by pigeons (Columba livia) and humans (Homo sapiens).
The orientation invariance of visual pattern recognition in pigeons and humans was studied using a conditioned matching-to-sample procedure. A rotation effect, a lengthening of choice latencies withExpand
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Categorical discrimination of objects and pictures by pigeons
With a three-choice instrumental discrimination procedure, pigeons were taught to distinguish small spherical objects from nonspherical objects. Spherical objects were defined as positive,Expand
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