Expectations about numerical events in four lemur species (Eulemur fulvus, Eulemur mongoz, Lemur catta and Varecia rubra)

@article{Santos2005ExpectationsAN,
  title={Expectations about numerical events in four lemur species (Eulemur fulvus, Eulemur mongoz, Lemur catta and Varecia rubra)},
  author={Laurie R Santos and Jennifer L. Barnes and Neha Mahajan},
  journal={Animal Cognition},
  year={2005},
  volume={8},
  pages={253-262}
}
Although much is known about how some primates—in particular, monkeys and apes—represent and enumerate different numbers of objects, very little is known about the numerical abilities of prosimian primates. Here, we explore how four lemur species (Eulemur fulvus, E. mongoz, Lemur catta, and Varecia rubra) represent small numbers of objects. Specifically, we presented lemurs with three expectancy violation looking time experiments aimed at exploring their expectations about a simple 1+1 addition… Expand
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References

SHOWING 1-10 OF 46 REFERENCES
Analog number representations in mongoose lemurs (Eulemur mongoz): evidence from a search task
TLDR
It is found that the amount of time lemurs spent searching was indicative of whether grapes should have remained in the bucket, and furthermore that lemur search time reliably differentiated numerosities that differed by a 1:2 ratio, but not those that differ by a 2:3 or 3:4 ratio. Expand
Spontaneous representation of number in cotton-top tamarins (Saguinus oedipus).
TLDR
The "violation of expectancy" looking-time methodology has proven a powerful tool for exploring prelinguistic mental representations in human infants as well as in nonhuman primates and is likely that these numerical representations are spontaneously available to a variety of primate species. Expand
Use of numbers by a chimpanzee
TLDR
The present study demonstrates that the chimpanzee was able to describe the three attributes of the sample items and spontaneously organized the ‘word order’. Expand
Object individuation using property/kind information in rhesus macaques (Macaca mulatta)
TLDR
Results from three experiments demonstrate that, like 12-month-old infants, adult rhesus macaques can use both spatiotemporal and property/kind information to individuate food objects, and provide support for the conclusion that in the absence of linguistic abilities, some non-human primates spontaneously use property/ kind information toIndividuate objects. Expand
Summation in the chimpanzee (Pan troglodytes).
TLDR
It was concluded that without any known ability to count, these chimpanzees used some process of summation to combine spatially separated quantities. Expand
Use of numerical symbols by the chimpanzee (Pan troglodytes): Cardinals, ordinals, and the introduction of zero
TLDR
An adult female chimpanzee with previous training in the use of Arabic numerals 1–9 was introduced to the meaning of "zero" in the context of three different numerical tasks, suggesting that the level of abstraction characteristic of human numerical ability was not attained in the chimpanzee. Expand
Evolutionary foundations of number: spontaneous representation of numerical magnitudes by cotton–top tamarins
TLDR
The results of familiarization–discrimination experiments on cotton–top tamarin monkeys (Saguinus oedipus) provide strong support for the hypothesis that representations of large, approximate numerosity are evolutionarily ancient and spontaneously available to non–human animals. Expand
Spontaneous representations of small numbers of objects by rhesus macaques: Examinations of content and format
TLDR
Five experiments using the violation of expectancy looking time measure with free-ranging rhesus macaques (Macaca mulatta) are reported here on, each designed to build on current knowledge concerning spontaneous representations of number. Expand
"Constructive" enumeration by chimpanzees (Pan troglodytes) on a computerized task
TLDR
Chimpanzee counting in this type of experimental task may be a process that represents magnitudes with scalar variability in that the memory for magnitudes associated with each numeral is imperfect and the variability of responses increases as a function of the numeral's value. Expand
Spontaneous number representation in semi–free–ranging rhesus monkeys
TLDR
The range of success achieved by rhesus monkeys in this spontaneous–number task matches the range achieved by human infants and corresponds to the range encoded in the syntax of natural languages. Expand
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