Grey Parrot (Psittacus erithacus) numerical abilities: addition and further experiments on a zero-like concept.
@article{Pepperberg2006GreyP,
title={Grey Parrot (Psittacus erithacus) numerical abilities: addition and further experiments on a zero-like concept.},
author={Irene M. Pepperberg},
journal={Journal of comparative psychology},
year={2006},
volume={120 1},
pages={
1-11
}
}A Grey parrot (Psittacus erithacus), able to quantify 6 or fewer item sets (including heterogeneous subsets) by using English labels (I. M. Pepperberg, 1994), was tested on addition of quantities involving 0-6. He was, without explicit training, asked, "How many total X?" for 2 sequentially presented collections (e.g., of variously sized jelly beans or nuts) and required to answer with a vocal English number label. His accuracy suggested (a) that his addition abilities are comparable to those…
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References
SHOWING 1-10 OF 94 REFERENCES
Numerical competence in an African gray parrot (Psittacus erithacus).
- Psychology
- 1994
An African gray parrot (Psittacus erithacus), Alex, trained to label vocally collections of 1-6 simultaneously presented homogeneous objects, correctly identified, without further training,…
Ordinality and inferential abilities of a grey parrot (Psittacus erithacus).
- Computer ScienceJournal of comparative psychology
- 2006
A grey parrot, trained to identify Arabic numerals 1-6 with the same vocal English labels but not to associate Arabic numbers with their relevant physical quantities, showed he understood number symbols as abstract representations of real-world collections and inferred the relationship between the Arabic number and the quantity via stimulus equivalence.
Number comprehension by a grey parrot (Psittacus erithacus), including a zero-like concept.
- PsychologyJournal of comparative psychology
- 2005
A Grey parrot that was able to quantify 6 item sets using English labels and demonstrated knowledge of absence of quantity, using "none" to designate zero demonstrated numerical comprehension competence comparable to that of chimpanzees and very young children.
Cognition in an African gray parrot (Psittacus erithacus): Further evidence for comprehension of categories and labels.
- Psychology
- 1990
This experiment was designed to examine further the comprehension skills of an African gray parrot (Psittacus erithacus). For each test trial the parrot was shown a different collection of 7 physical…
Proficient performance of a conjunctive, recursive task by an African gray parrot (Psittacus erithacus).
- PsychologyJournal of comparative psychology
- 1992
The comprehension skills of an African gray parrot, Alex, were tested on a taks that included a conjunctive condition and indicated that he understood all the elements in the question, including the conj unctive condition, and that he used these elements to guide his search for the one object in the collection that provided the requested information.
Acquisition of a relative class concept by an African gray parrot (Psittacus erithacus): discriminations based on relative size.
- Biology, PsychologyJournal of comparative psychology
- 1991
An African gray parrot, Alex, responds to stimuli on a relative basis and after learning to respond to a small set of exemplars on the basis of relative size, transferred this behavior to novel situations that did not provide specific information about the absolute values of the stimuli.
Addendum to "Summation in the chimpanzee (Pan troglodytes)".
- BiologyJournal of experimental psychology. Animal behavior processes
- 1988
This work investigated the effect of having one quantity in common in both pairs of chimpanzees, and found that summation was based on both quantities of each pair and not on some simpler process such as the avoidance of the tray with the smallest single amount or selection of the Tray with the single largest amount.
Numerical competence in a chimpanzee (Pan troglodytes).
- Psychology, BiologyJournal of comparative psychology
- 1989
It is demonstrated that counting strategies and the representational use of numbers lie within the cognitive domain of the chimpanzee and compare favorably with the spontaneous use of addition algorithms demonstrated in preschool children.
Spontaneous use of magnitude discrimination and ordination by the orangutan (Pongo pygmaeus).
- Biology, PsychologyJournal of comparative psychology
- 2001
Orangutans attend to differences in magnitude and can spontaneously use ordinality, suggesting that the ability to discriminate quantity is descriptive of general cognitive ability and a cognitive difference between chimpanzees and orangutan is suggested.
Object permanence in the African Grey parrot (Psittacus erithacus)
- Psychology
- 1986
An African Grey parrot was assessed for object permanence using tasks designed for human infants. The subject showed concepts of object permanence directly comparable to primate and nonprimate…