Animal Cognition

, Volume 12, Issue 1, pp 193–199 | Cite as

Relative quantity judgment by Asian elephants (Elephas maximus)

  • Naoko Irie-Sugimoto
  • Tessei Kobayashi
  • Takao Sato
  • Toshikazu Hasegawa
Original Paper

Abstract

This study investigated whether Asian elephants can make relative quantity judgment (RQJ), a dichotomous judgment of unequal quantities ordered in magnitude. In Experiment 1, elephants were simultaneously shown two baskets with differing quantities of bait (up to 6 items). In Experiment 2, elephants were sequentially presented with baits, which could not be seen by elephants in their total quantities. The task of elephants was to choose the larger quantity in both experiments. Results showed that the elephants chose the larger quantity with significantly greater frequency. Interestingly, the elephants did not exhibit disparity or magnitude effects, in which performance declines with a smaller difference between quantities in a two-choice task, or the total quantity increases, respectively. These findings appear to be inconsistent with the previous reports of RQJ in other animals, suggesting that elephants may be using a different mechanism to compare and represent quantities than previously suggested for other species.

Keywords

Numerical cognition Relative quantity judgment Elephants 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Naoko Irie-Sugimoto
    • 1
  • Tessei Kobayashi
    • 1
    • 2
  • Takao Sato
    • 3
  • Toshikazu Hasegawa
    • 1
  1. 1.Department of Cognitive and Behavioral Sciences, Graduate School of Arts and SciencesUniversity of TokyoTokyoJapan
  2. 2.NTT Communication Science Laboratories, NTT CorporationKyotoJapan
  3. 3.Department of Psychology, Graduate School of Humanities and SociologyUniversity of TokyoTokyoJapan

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